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Declination Knob Hex Wrench Size

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14 replies to this topic

#1 David Illig

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Posted 15 September 2015 - 08:16 PM

My dec knob is loose. I have a zillion hex wrenches, but none seems to fit that tiny set screw. I know I had a hex wrench to fit it, but I probably put it where I couldn't possibly lose it. Anyone have the specs?

 

Thanks!


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#2 Billydee

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Posted 15 September 2015 - 09:18 PM

David,

 

It is a Bristol wrench not a hex or allen wrench.  Sorry I can not remember the size.

 

Bill



#3 David Illig

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Posted 15 September 2015 - 09:22 PM

Yeah, I kind of figured it must be a Bristol. Had some Bristol wrenches once, have no idea what happened to them!

 

Thanks!



#4 Billydee

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Posted 16 September 2015 - 12:54 PM

David,

 

It is odd that when you order a Power Declination Motor the kit comes with the Bristol Spline Wrench and a 1/4" Allen Wrench.  You take the old declination knob off with the Bristol and you put the replacement declination knob on with the 1/4" Allen.

 

Bill



#5 David Illig

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Posted 16 September 2015 - 09:07 PM

Indeed. I don't have the Power Declination Motor, but I have the fine dec control and it has its own knob. It is held on by an allen set screw. Questar sells the Bristol wrench @ $2.75 so I'm going to order two or three of them--and put them where I can't lose them  :)

 

Thanks again for taking time to reply.

 

David



#6 Billydee

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Posted 16 September 2015 - 09:44 PM

David,

 

I always wondered why they never standardized on the 1/4" Allen.  I guess that is why we love Questar.

 

Bill



#7 Les Aperture

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Posted 17 September 2015 - 09:02 PM

IBM used Bristol setscrews on most of the old mechanical equipment. You can torque the setscrews much tighter without stripping out the socket.  



#8 DAVIDG

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Posted 18 September 2015 - 10:48 AM

Questar included the Bristol wrench. Look in every pocket in the case and look down so you can see the bottom of pockets. I know of number of owners including myself that thought they did not  have the wrench and I found mine in the case of 1961 Q still in the original envelope way down in one of the pockets.

 

                        - Dave 



#9 JREnglar

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Posted 18 September 2015 - 08:19 PM

Questar included the Bristol wrench. Look in every pocket in the case and look down so you can see the bottom of pockets. I know of number of owners including myself that thought they did not  have the wrench and I found mine in the case of 1961 Q still in the original envelope way down in one of the pockets.

 

                        - Dave 

 

Not only did I find a Bristol Wrench at the very bottom of the power cord pocket of my recently acquired 51 year old Questar 3.5 but  two leather case keys as well (all oiled in a small plastic bag) as well. I'm reasonably sure they were there from the beginning.

JRE


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#10 Starsareus

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Posted 18 September 2015 - 08:36 PM

Anyone have an alternate source for the "key" for a 3.5" from the 60s? Thanks(Quester does not carry them)



#11 JREnglar

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Posted 18 September 2015 - 08:47 PM

Anyone have an alternate source for the "key" for a 3.5" from the 60s? Thanks(Quester does not carry them)

 

Try the following link from an old post of mine (or just search for "key" on this forum). It might be of some help. 

 

http://www.cloudynig...ey#entry6208289

 

JRE


Edited by JREnglar, 18 September 2015 - 08:47 PM.


#12 Billydee

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Posted 18 September 2015 - 08:51 PM

Starsareus,

 

Take your case to any good sized locksmith shop and he will be able to make one in about 5 minutes.

 

Bill



#13 DAVIDG

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Posted 19 September 2015 - 03:33 PM

 The key is a Cheney #30. Look on Ebay ,that is were I got two of them a while back. They are also used on Fender guitar cases. Here is a link to  a listing http://www.ebay.com/...=item43de4fe634

I also purchased a Bristol Spline wrench set SS-508 that contains the wrench size that fits the Dec knob. Here is an Ebay listing for what I purchased http://www.ebay.com/...affe5e7&vxp=mtr

 

 

 

                 - Dave 


Edited by DAVIDG, 19 September 2015 - 03:37 PM.


#14 93711dude

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Posted 19 September 2015 - 04:14 PM

DAVIDG - thanks very much for all the helpful info  :)



#15 Optics Patent

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Posted 01 November 2016 - 02:03 PM

I'm sure it's posted elsewhere, but the size of the Bristol wrench for the knob set screws is 0.060" (outside diameter of the wrench).  The size for the control box attachment screws and finder mirror bracket screws is 0.096"

Sources include eBay and Amazon.  Xcelite on Amazon is nice (9962, 9966) but note that you'll need an L-shaped wrench with a short leg to remove the finder mirror bracket.

 

It was a little startling to have the 4" long shaft of that tiny wrench twist by about 1/2 rotation before the screws broke loose.




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