T/T2 thread - 1.25" filter thread adapter

This is a project improving some astro stuff based on my friend's project.

ASI224MC and ASI462MC cameras are very sensitive in terms of IR. If you use them with an Evoguide ED guider with dedicated SW fierld flattener, there is no place for a IR/UV Cut filter, which is advised for guiding. The cameras have a T/T2 thread (M42x0.75), the 1.25" filter has M28.5x0.6 thread, while the 1.25" filter fits inside the SW field flattenr with enough clearance.