Did you check behind the flywheel, while the tins were off, to clean out any animal or insect nests and debris?
I've a new starter on hand (over 2 years now) for my 1872 #1 and I plan on peeking behind the flywheel when it gets installed. I have been getting by using a hammer and a piece of bar stock. In my case the starter is not weak (not yet anyway) but the ground connection where the starter is connected to the engine is weak. I would have to remove the tins to tighten the starter to the engine block, yup, pull the M18 to do that. The PO claimed he put a new starter in this tractor just prior to my buying it. I think he did but forgot to tighten it in place. I hadn't had the tractor long before I heard the arcing and saw the sparks at the battery lead to the starter. Had an 1/8" gap between the nut and battery cable sta-con. I thought it amazing the starter engaged at all but it did work for several months until it didn't. I tightened the battery lead and it worked again for maybe 6 months before I would periodically have to give it a BANG with the hammer. I don't recommend this type fix to anyone because delivering the BANG if done wrong could result in breaking or dis lodging a magnet/s and then the starter is ka-put, scrap.
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