with one difference, at the back there are two deep grove ball bearings.
He writes:
Sized imperially, the ball races consisted of two opposed angular contact ball bearings behind the wheel with a single deep groove ball bearing at the drive pulley (rear) end. Interestingly, if the angular contact bearings are dismantled (they push apart) an owner reports that they can be revived by polishing the races lightly with diamond paste, fitting new balls and lubricating with ordinary lithium grease.
The spindle of my variant runs in two angular contact bearings, each pair in back to back (DB) arrangement. The preload adjustment is not clear, need to do more research here. The bearings are of imperial dimensions ID 25.4 OD 63.5 ( 1" x 2.5" ).
The spindle assembly is pulled out to the front, there is a hole in the middle to restrain the shaft from rotating.
Once out, the bearings pull apart and the balls measure in at 10.30 mm since this is an imperial sized bearing my thinking is this was probably a 13/32" ball. (10,31875mm ). Initial measurements of the races ID and OD confirm this.The replacement is still manufactured under the following names from R&M, SKF and some other brands.
RMS8 MJ1 - Deep Grove
AMS8 MJT1 - Angular Contact
Since the bearings show significant wear, there are two options under consideration.
1) Use 7006 bearings 30x55mm and machine new sleeves to fit the 1" shaft and 2.5" outer seat.
2) Do what Tony describes. Order new balls, polish the races and see what I get.
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