Don't think a typical Woods three jaw coupler will dampen torsional loads much. A Woods Sure-flex would probably do a better job but they are more expensive. There are a number of flexible elements to choose from.
Most three piece couplers are designed to compensate for radial and angular offsets and not for pulse evening.
I run a Valby 5" chipper off my 504. I have never had any problems. Good chippers are designed to absorb impact loads. It is done at the heavy knife plate (flywheel).
Anyway, Surplus Center has the three-piece three-jaw couplers. They are also in abundance on eBay.
I consider the SMTA PTO as quite robust considering all the rocks I have ground up in my bush hog.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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