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Focuser question

Started by tnboy426, 01/14/2006 02:08AM
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Posted 01/14/2006 02:08AM | Edited 01/14/2006 02:09AM Opening Post
Michael Brannon
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Join Date: Jan 2003

Location: Clearwater FL, US

Posts: 59

I'm looking to replace the set screws in my focusers with some nylon thumbscrews so that I don't get set screw marks on my eyepieces anymore. I've found where to get them, but they have a lot of different sizes. So, I was wondering if anyone out there could tell me what size(s) they are. I presently have 2 scopes. One is a Hardin 8" dob, and the other has a JMI Crayford. I would like to replace the set screw that holds the eyepiece, and the one(s) that hold the 2" to 1.25" adapter.
Thanks in advance for any replies...
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Posted 01/14/2006 03:49AM #1
Hugh Bartlett
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Location: Oakland CA, US

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Take one of the original screws down to the hardware store. They will have a metal plate with a bunch of tapped holes in it to help you determine the thread pitch and diameter.

Hugh Bartlett
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Posted 01/14/2006 01:24PM #2
Bob Polcyn
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Hi Michael --

I often opt to use a larger size than the ones used on some commercial equipment in order to increase sturdiness of the nylon. This requires drilling and tapping but it's not hard to do.

Bob Polcyn
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