Guest zidder Posted March 4, 2015 Share Posted March 4, 2015 Does anyone know the thread size for the secondary mirror adjusting screws on 10" dob ? Thanks Link to comment Share on other sites More sharing options...
Doc Posted March 4, 2015 Share Posted March 4, 2015 I think the thread size is M4 But see if anyone else confirms it. Link to comment Share on other sites More sharing options...
stash Posted March 4, 2015 Share Posted March 4, 2015 yep m4 on my sw250 Link to comment Share on other sites More sharing options...
Guest zidder Posted March 4, 2015 Share Posted March 4, 2015 Thumbscrews - these are approx 30mm long. The head is 12mm long x 10mm diameter at its widest part; the threaded section is approx 18mm long x 4mm diameter. The thread is M4 x 0.7 pitch and runs nicely in the wall lugs with that thread. These look quite nice, not sure if 18mm worth of thread is enough Link to comment Share on other sites More sharing options...
Doc Posted March 4, 2015 Share Posted March 4, 2015 I think 18mm of thread is a bit on the short side, how long is the original allen head screw? Link to comment Share on other sites More sharing options...
BAZ Posted March 4, 2015 Share Posted March 4, 2015 You are correct, it's M4. You will need around 35mm of thread to ensure you have the full range of movement. I'll have a look, I made some up and I don't know if I have any left. Link to comment Share on other sites More sharing options...
Guest zidder Posted April 21, 2015 Share Posted April 21, 2015 Managed to make some screws If anyone wants some I have enough materials left to do another six Link to comment Share on other sites More sharing options...
Guest zidder Posted April 21, 2015 Share Posted April 21, 2015 (edited) posted twice for some reason Edited April 21, 2015 by zidder Link to comment Share on other sites More sharing options...
Guest StevenWhatley Posted April 21, 2015 Share Posted April 21, 2015 I'm guessing these would fit my 250p Dob - if so I would love some so I can throw the silly little allen key away Link to comment Share on other sites More sharing options...
Johnnyaardvark Posted April 21, 2015 Share Posted April 21, 2015 I would also be interested Gary assuming they would fit a 200p... Link to comment Share on other sites More sharing options...
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