I had what I believe was a Milwaukee MA957 as well - it was a BlueLine unit, but I swear it was a re-branded Milwaukee. (Actually still have it in a box someplace.)
Anyway, I just took the bubble counter off. Unscrew it from the (highly crappy) needle valve, then unscrew the nipple from the top of the bubble counter and screw it back on where the bubble counter was.
Use a separate bubble counter if you need one. I just count the bubbles entering my reactor.
Regards,
Mike