I polished a bit more of the hill between the valleys. Maybe a very slight improvement. Will have another go today at removing a bit more.
While the bolt was pulled apart completely, degreased and brakleen'd everything. Will try a really light oil.
Tried to get a video but when closing the bolt, the pin at the very rear of the bolt seems to actually get lifted out of the little divot over the hill then drops back into the next valley. Also seems to rotate a small amount while doing this.
Average video but hard filming such a small piece.
https://www.youtube.com/watch?v=WbzypSDVbxo
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