I had a tour of a manufacturing facility last week when they make the tools that go up the old urethra Franklyn to perform prostate surgery.
They are a lot thicker than you would expect. It brought a tear to the eye just thinking about it.
Apparently if they are having trouble getting it up there they have a blade that they can slide up there and pull out to slice the inside of your John Thomas to open it out a bit, as apparently a slice heals better than a 'rupture'.