Speaking of the Jaegers lens cell. My lathe master friend slash machinist slash engineer came to my rescue again. The cell had 4 holes for the dew shield and only 2 for the OTA. All screws were flanged flat head self tapping, so of course whatever threads were there were shredded. So he added 2 more holes on the OTA side, drilled out and tapped all 8 holes with matching threads and put some button head torx machine screws and slightly elongated the drill holes on the OTA side to allow for minor collimation adjustments.
Do the threaded holes go thru the part of the cell that is threaded for the retaining ring?
One reason I ask, is when building my 4, I followed the instructions and drilled and tapped only the holes in the tube so the screws only hold the cell in place by pressure. They called them setscrews. I always thought about changing that but when refurbishing the scope I realised it meant drilling and tapping the section of the cell where the retaining ring's threads are inside and it's too thin not to drill and tap all the way thru it's wall. BTW, the instruction are the same for the 4 and the 6 and they say to only use two setscrews for the cell and two for the focuser, but I used three for both and only one for the dewshield.
Edited by Kasmos, 16 January 2022 - 03:31 AM.