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Author Topic: PM research thread help  (Read 792 times)

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Re: PM research thread help
« on: March 09, 2024, 12:26:12 pm »
1/4 - 40 may well be a good guess, but the fact is that it may be an engine built from a castings kit by a home hobbyist who could have used almost any sized tap to produce your engine's steam inlet!

My own PMR #3 has a 3/16 - 40 thread at that location.
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