Reply to DM2 crossfader mod?

Hello all,
I've had several DM2s and notice that the crossfader B side is really flakey.
When you fade all the way to B, say that it should be a value of 128, what you actually get is a value that jitters between 125 and 128. I've only really had experience with it on the mac, but it seems like an issue common to DM2s. I was looking to replace the crossfader, but couldn't source a working drop in for the stock one.

Has anyone else encountered this issue and overcome it?

Thanks!