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As Astro_south has pointed out the normal configuration is 3 push-pull screws .Each of these are fitted with springs capable of supporting the mirror. The springs also add enough pressure to keep the adjusting screws as set.
Why would anyone want to complicate a simple ,tried and proven system with another 3 screws?
With a simple 3 screw system I know I can tweak collimation in the dark if need be. It's a simple excercise. Why confuse the situation with 3 more screws?
Fact........The fault lies in the factory fitted springs which aren't capable of supporting the mirrors. Probably the same springs for a 6".
Solution.........Replace the springs.
Simple logic....Find the problem and fix it,dont patch it.
Each to their own but the $1.50 I spent on springs means I can maintain collimation easily.
Slice
I did a search for this problem first but couldn't find anything.
Now I know why.
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