Nutholder for Newtonian telescope 130

When need to open your telescope to clean or mark your main mirror, you need to unsrew the bottom cap. In some cases the cap is held by 4 screws and nuts are just "free" inside.

This is manageble to dissamble, but assembling is much harder due to lenght of the tube. This part solves this issue - it holds the nuts in place for you - tested on Omegon 130/920mm

To save space I used M4x4 inserts insted of original nuts - design si more compact.