They are ball -type bearings and I assume I could replace them... I know they are pressed on to the shaft that has the armature and windings and without a proper jig or press to remove them I would probably trash something beating on them. I do have a puller of sorts... its for power sterring pulleys but if it gripped the bearing case good and pushed the shaft square it would work.
Perhaps I could pull the seals and give them a good greasing with MPG and buy some time.
I saw the heatsink you are talking about... it would definatley be a work saver for these blocks. Currently I am making a second block like the one I made...after that I may order one of those.
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dirt rules
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