Cutting Squish / Bands, Bases, Perfectly-Mating Surfaces, etc. All w/ Basic Equipment (No Lathes!)

I want to be clear Re bore-perimeter-measurements, that it is VERY critical just HOW you use your calipers to take your (frequent&thorough) depth-measurements, the way you "sit" the bottom of the calipers onto the cylinder-base as you protrude the depth-gauge is something, you will find, that is VERY easy to alter readings by 2-3thou+ with the slightest changes of angle, so it's imperative that you're CONSISTENT with how you're holding your calipers' base against the cylinder-base when doing around-the-bore checkups through such operations, being ACCURATE with the depth gauge is of course of VERY high value however for this stuff but the CONSISTENCY around the perimeter of the bore is what matters above all (IE, even if the depth-gauge read wrong, and you cut 20% deeper than intended, at least it would be an EVEN cut, hoping that makes sense!!) Thanks for watching & please subscribe & comment if you found anything worthwhile here, I've got a good deal of tricks but of course don't want to put them up just for the sake of it, can always keep it to climbing-only ;D )