Wrist pin bushing reamer. The wrist pin bushing reamer has a taper in one end (brass) with a tapered screw. Place in the bushing apply compound and spin.Turn screw,apply compound,spin.Gets an exact fit EVERY time.
Oops my bad. Here's the right pic
can't post pic of pin reamer. Sorry.
I use micro drills for my jets. Most people are afraid to screw up the "flow pattern". The only thing that really matters though is the size of the hole.
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