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Best way to plug old screw holes in an OTA?

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18 replies to this topic

#1 thecelloronin

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Posted 17 April 2021 - 11:14 AM

This question applies to both steel and sonotube. What's your recommended method and material for plugging old holes?


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#2 mboothe

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Posted 17 April 2021 - 11:21 AM

Screws are the commonly accepted method of plugging unused screw holes. Barring that, plastic plugs can be purchased for the purpose. If painting is desired bondo or other hardening putty can be used. I think that’s all I’ve got.


Edited by mboothe, 17 April 2021 - 11:22 AM.

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#3 greenstars3

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Posted 17 April 2021 - 11:27 AM

A short screw of the same thread and diameter as the original hole works great in SCT tubes that have threaded holes and in sonotubes just use black spray paint on the nuts that will go on the inside of the tube before installing 

 

Robert

 

edit:mboothe you posted while I was typing - I agree


Edited by greenstars3, 17 April 2021 - 11:30 AM.

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#4 havasman

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Posted 17 April 2021 - 11:54 AM

I like simple solutions that work. When I replaced the spider on the XT10i I covered the old holes with a little piece of gaffers tape on the inside and out. That was years ago and it's never once come to mind since.


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#5 daquad

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Posted 17 April 2021 - 01:44 PM

In my scopes I tape the inside of the hole with aluminum repair tape, then fill the hole with epoxy and smooth to the tube  surface with a putty knife.  After the epoxy cures, the inside tape can be removed and a dab of flat black paint applied.  If you sand and repaint the outside of the tube, the repair disappears.

 

Dom Q.


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#6 thecelloronin

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Posted 17 April 2021 - 01:55 PM

Thanks y'all, I got what I came for here.



#7 izar187

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Posted 17 April 2021 - 04:41 PM

I confess to touching up the hole on the inside of the tube with black, and the outside of the tube with the color that the tube is on the outside... and ignoring them after that.



#8 MitchAlsup

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Posted 17 April 2021 - 05:11 PM

Sonotube can have holes fixed with paper machete or epoxy.

 

Metal tubes can be epoxied, welded, brazed, fiber glassed, riveted, or have a bolt cinched up.



#9 gene 4181

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Posted 17 April 2021 - 07:07 PM

  If its a "dob"  , i just use a color matched  electricians tape , smile.gif


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#10 sevenofnine

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Posted 18 April 2021 - 06:45 PM

If the holes are small there are plugs made for drip irrigation systems that work really well. Cheap and just press them in. waytogo.gif


Edited by sevenofnine, 18 April 2021 - 06:46 PM.

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#11 teashea

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Posted 18 April 2021 - 09:04 PM

This question applies to both steel and sonotube. What's your recommended method and material for plugging old holes?

You can go to Ace Hardware and check out the plastic hole plugs that they sell.  


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#12 SteveG

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Posted 19 April 2021 - 05:05 PM

https://www.mcmaster...-panel-plugs-6/



#13 Jon Isaacs

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Posted 19 April 2021 - 05:15 PM

  If its a "dob"  , i just use a color matched  electricians tape , smile.gif

 

:waytogo:

 

Even with a refractor, I'll cover a hole with a piece of tape.  A small hole or two is of little consequence and I may want use the hole again later.

 

Few OTAs are anything close to sealed. One only has to inspect the focuser to see large gaps..

 

Jon


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#14 teashea

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Posted 19 April 2021 - 07:15 PM

waytogo.gif

 

Even with a refractor, I'll cover a hole with a piece of tape.  A small hole or two is of little consequence and I may want use the hole again later.

 

Few OTAs are anything close to sealed. One only has to inspect the focuser to see large gaps..

 

Jon

Unless one is interested in visual aesthetics.  



#15 Jon Isaacs

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Posted 20 April 2021 - 09:50 AM

 

Unless one is interested in visual aesthetics.  

 

The holes the OTA are glaringly obvious... 

 

Celestron ST-80.jpg

 

Or maybe not..

 

Jon



#16 thecelloronin

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Posted 20 April 2021 - 12:18 PM

Where's Waldo?



#17 PJ Anway

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Posted 23 April 2021 - 06:51 PM

Here is what I used to plug the screw holes in my metal OTA from removing the dob's altitude bearings (I converted my newt to a ring/dovetail mount).

Black plastic rivet with a rubber washer inside. The plastic rivets work good and can be shorten easily with cutting pliers, but they are loose. The added rubber pushed on from inside the OTA tightens the rivet.

 

hole plug.JPG


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#18 SteveG

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Posted 24 April 2021 - 12:11 AM

Here is what I used to plug the screw holes in my metal OTA from removing the dob's altitude bearings (I converted my newt to a ring/dovetail mount).

Black plastic rivet with a rubber washer inside. The plastic rivets work good and can be shorten easily with cutting pliers, but they are loose. The added rubber pushed on from inside the OTA tightens the rivet.

 

attachicon.gifhole plug.JPG

Where do you get them?


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#19 PJ Anway

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Posted 24 April 2021 - 10:38 AM

I got mine at the local hardware store, but you can get them at Graingers, MSC hardware, amazon, ebay, etc. Some places call them "panel rivets".


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