9 replies to this topic

[StarWars]

Repairing a Stiff or Binding Dec Slow Motion Knob.

http://home.att.net/...ssin/etxdec.htm

[mattyfatz]

I dont think this is applicable to the ETX 70. The knob has a 1" plastic thread, instead of the brass one in your photo.

[WhiteLight]

I have a siff/ Binding RA knob. Any ideas? It doesn't twist smoothly, but sticks, making panning quite jumpy.

Edit: Ah. Same guy has a page for this problem as well: Link:

[dengwer]

My wife's ETX 90RA had a sticky dec knob. Upon taking the arms apart I found that the two knobs were both just screwed on to the ends of the shaft. I just grabbed both knobs and unscrewed them slightly (took alot of force with pliers). They work smoothly now. The AZ knob also was jumpy. I took it apart and saw that one plastic disc rode inside another. All kinds of oil, grease, graphite was tried to no avail. I finally rubber cemented (in case I needed to undo it) 3 tiny slivers of easy gliders onto the bottom disc spaced equally around. It is smooth as silk now.

David

[Westseen]

This Link is dead?

[cnlson]

This Link is dead?

http://www.schlatter...etx90decknb.htm

http://www.weasner.c...htips/etxtu.htm

[JW49656]

I have been unable to get the DEC KNOB to come lose on a 8” lx 200 Meade. Any ideas on what to do?

[JW49656]

I forgot to say it has set up a couple of years. That is what was told. I just bought it it looks new. It was stored upstairs in a very nice home. The owner said the only reason for selling it was cause he hadn’t used it in two years. Hope that is not a bad thing.

[JW49656]

I was able to get it lose by using a flat bottom punch on the ribs of the knob . I tapped it very lightly with a small brass hammer. It came lose on the third tap. Hope this helps everyone who has this problem . Everyone have great viewing .  JW

[Supernova74]

My wife's ETX 90RA had a sticky dec knob. Upon taking the arms apart I found that the two knobs were both just screwed on to the ends of the shaft. I just grabbed both knobs and unscrewed them slightly (took alot of force with pliers). They work smoothly now. The AZ knob also was jumpy. I took it apart and saw that one plastic disc rode inside another. All kinds of oil, grease, graphite was tried to no avail. I finally rubber cemented (in case I needed to undo it) 3 tiny slivers of easy gliders onto the bottom disc spaced equally around. It is smooth as silk now.

David

David 

1) lucky you got a wife I haven’t lol poor me 

2) even more lucky you have a partner to share the hobby with