I recall seeing a list of internal bore diameters taken along the entire length of a (I think some nice vintage Olds) trumpet...measurements taken about every inch along the instrument. For some reason, I just cannot seem to find this information now. Does anybody recall this? I checked over the more well-known Olds sites and didn't spot it. The reason want such? Want to start rough CAD design of three-section molded plastic super-micro-pocket trumpet with integral porting.