Got some guidescope rings in (solid type - I detest the rings with 6 adjustment screws). The finder-guider I use is a 53mm tube OD, whereas these rings have an ID of 52mm, so I need to lose 1/2mm each side (or 1mm inner diameter).
I want to do this accurately, without it looking like a hacksaw and hammer bodge job. I do NOT have access to a lathe or mill, and a 53mm reamer is gonna cost a small fortune, so...
Reckon it would take long sanding out 1mm of aluminium by sticking a sheet of 60 grit paper on a 53mm can? (I have several spray paint cans who's diameter is 53mm - the added 1/2mm of the paper should give me enough space for some thin felt). Or is there a better way? I am NOT going to resort to the inaccuracy of using a drum sander on a Dremel
My OCD perfection requires I do it right