aaron wrote:
its the circlip for the drop gear bearing. there are two, one on each side of the bearing to hold it into place. I just replaced this bearing and it looks to fit the bill.

It may or may not become and issue....
Late rodchange boxes had none at the back (ie inside the box), they have a shoulder there instead.
I have often left the front one out over the years (when they got lost), never seen a bearing move yet.
It takes serious puller power to wind these puppies out when replacing them.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
