So last weekend I was drilling and tapping the R6 swingarm to fit the GP lifters and sharks fin. I was in a bit of a rush towards the end as I had an appointment to get to. Big mistake, I was extracting the 6mm tap from the last hole I had drilled ... and it broke.

It was firmly in there maybe 20mm in a blind hole. Farq!

So I walked away from it and did some research over the week. I found out about a watchmakers trick that uses alum to dissolve HSS without destroying the aluminium. Talk about a lucky find.

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I bought 1kg of lab grade (98% pure) alum and have started the process. It's still bubbling away.



I have a small hot plate I am going to hook up tomorrow to get the temp up to get a faster reaction.