Posted by Chuck on June 29, 1999 at 01:12:19:
In Reply to: How is "bore" measured? posted by Jason on June 28, 1999 at 21:42:38:
Just pull the second slide and measure the inside diameter of the slide tube-a dial caliper is the right tool to use for this purpose. Thus, the inside diameter of the second slide tuba of a Miraphone 186-4U is 0.770 inch. Actually, just now mine seems to measure about 0.765, but that's close enough; there's probably .005 worth of gunk in it.
Now, what bore size has to do with anything is a completely different kettle of fish...