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Need help with TX200 piston latch rod thread size.

March 27 2012 at 6:16 PM

Ed Canoles  (Login nced1)

The latch rod of a TX200 piston unscrewed from the piston with a bit of applied heat to soften the thread locker and I'm in the process of creating a long TX piston rod so UK spec velocities can be achieved without a "weak spring" or clipping coils.

I am a bit puzzled by the latch rod thread size. The latch rod diameter measures 9.92mm (I'm assuming 10mm nominal), and the thread pitch is 1.5mm.

Now the puzzling part, the latch rod will freely thread into the piston after cleaning off the thread locker, however my 10x1.5mm tap won't freely screw into the piston and the latch rod won't freely screw into a 10x1.5mm die.

What am I missing, will I have to single point cut the thread on my lathe?

Any advice to this North Carolina "wanna be" springer butcher is greatly appreciated.

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