It looks like there are two removable collars, each is approx. .215" thick. I just measured it in the housing, so I didn't pull it apart - but that's what it looks like from the pictures.
So it looks like total, you can remove .430" if you need to. Seems like a lot.
Of course, once you take this "preload" out, you need to do a good job of clutch adjustment to make sure you protect your synchros... but that's another thread...
Here's the McLeod Data From Summit...
Summit Racing Part Number:
MCL-16525
Bearing Retainer Diameter:
1.310 in.
Notes:
Adjustable to three different lengths: Position 1= 1.345 in., Position 2= 1.530 in., Position 3= 1.700 in.. Bearing face - 3.000 in.
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