I re threaded my Fathers M many years ago, and I had the same problem. I took a good 8 foot 2X4 and drove a spike through with the pointed end sticking out enough to go in the center of the tap. This nail was about 2 ft from one end. Then we ran a chain around the short end of the 2X4 down to something solid, don't remember what, the M had a loader on it. then Dad pulled down on the other end to put significant pressure on the tap, I held it square and started it. after a few revolutions then the pry was not necessary any more, and I tapped the manifold deeper as Jim suggested. I had a piece of stainless pipe with lots of threads on it and used anti-seize to assemble it, worked good. Good luck!
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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