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While my sympathies tend to lie with Roger’s views on this subject if someone did want to experiment why not machine up a “crescent moon” insert rather than remove metal from a part that seems to have marginal strength anyway?

This insert could be sprung into the existing groove, the horns of the moon placed adjacent to the oil-way leaving it ideally placed to take advantage of any additional oil pressure/flow. In order not to compromise balance it would probably be wise to make it of something light and it would also need to be positively locked in place.

On the approach of “first do no harm” at least any “interfering” with a sound crank would be kept to a minimum!