I'm planning on replacing the secondary mirror holder (and possibly the spider too if it is necessary). It's a sizeable secondary (3" on the short axis) so the holder needs to be reasonably solid. It's beyond my machining tools and abilities so I'm going to have to buy one. I was wondering if anyone had any particular brands/manufacturers you could recommend.
Peter
I have purchased and used 2 Astrosystems holders and spiders. See http://astrosystems.biz/sechold.htm
I have been happy with them and actually find the 4 collimation points easier to use than a 3 point system. I believe Peter uses these in his SDM's.
