I just purchased a used 6" f/5 Orion Starblast. The plan is to replace the 1.25" Starblast focuser with a 2" GSO dual-speed focuser.
What's the best method to enlarge the focuser hole? Aviation snips? Hole saws? Besides removing the optics, anything else I should do to the "patient" prior to "surgery"? I've got access to a few local machine shops, but I'm trying to find out what's involved if I choose the DIY route.