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it's a regular acs boa with the bearings replaced with sealed one's and a thicker axle.
got a couple of reaction boa's here, one 10mm and the other 8mm. the 10mm uses a m10x1 nut. the original nuts are 3mm thick and there's 3 of them.
i'll post up a couple of pics tomorrow.
For god sake some one post a pic of this damn thing
there are no numbers on the bearings but i ordered a vernier caliper the other day, so when it turns up i'll get the sizes of them.