Wasn't sure if this belonged in the DIY section, so with apologies if this is incorrectly placed....
Have a nice scope with a tube dimension for which I have been unable to find rings. Found a recent pair in the classifieds that fit great, but are just slightly (probably less than a couple of mm) too large.
The last really nice set of rings I used on a tube came with this thick cotton material, almost like carpet jute, that didn't mar the tube but did compress sufficiently to hold the undersized tube TIGHT.
Looking for something similar. I hesitate to use cheap weather stripping or rubber material as I'm afraid the sheer forces of compressing it in the rings will transfer the color, permanently, to my tube body.
What do you guys use for filling in the space between rings and slightly undersized tubes?