A bit ago I was asked if I could make and fit a latch rod in a TX piston that was longer than standard so the gun owner could shoot at 12fpe without necessarily resorting to weal springs or clipped spring coils. On one of the UK sites it was mentioned that a TX latch rod that was 14mm longer than normal would accomplish this power reduction.
Well, after messing with trying to cut single point threads on my LatheMaster and finding that it was a pretty tedious process (even though it does work well when done right), last week I ordered a good 10x1.5mm split adjustable die on line. When I returned to NC today and picked up my mail at the post office the die had arrived so I put it to use.
WOW!!! Even thought it wasn't one of the $50 really good dies (only cost around $15), I adjusted it and found that it would easily cut a thread on my O1 tool steel rod, and the thread was a nice tight fit with the 10x1.5mm tap in the piston itself, unlike the 10x1.5mm tap from my Chinese tap and die set that cut a sloppy thread with a lot of difficulty! Here is a pic of my completed longer TX piston latch rod below the factory latch rod.........
My little experimentation with single point threading was pretty valuable (especially cutting metric threads on an inch machine), but for smaller threads like 10mm I found that using a GOOD adjustable die is a lot quicker than changing gears and chasing a thread a couple thou at a time on the lathe!
Anywhoo......I've actually measured two TX pistons and found that the dimensions of the piston itself do vary a few thou, so I'm hoping that the geometry of my home made latch rod is close enough to the factory part to function correctly.