hassler small (90.5 k)
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Steel bushings can be fabed to fit the openings,welded in and line bored to accept Model T bushings. Then, should they become worn,are easily replaced.I use a machinest who has done several sets like this.
We always Brass them up, and machine back to standard.
Keep them greased, and they will last for ever.
Herm when you say brass them up do you mean build them up with brazing rod ?
This is the way they are usually found nowadays, but what I think the mystery is, the bolt does not pivot in the arms! Note the locking ledge, that the pivot bolt has a flat to go against. There must be just enough "wiggle" that the wear occurs.
So, maybe one should fit their bolts so the fit fo the head is very tight against that ledge? (add braze to the bolt head & file down to just fit???)
Of course, the use most of us put on our Ts, and the attention to lubrication, Herm's probably right, out live us!