Hi, this is my first post on this forum, so thanks in advance for any feedback. I have a Bridgeport M head machine with a dovetail ram that was originally built in the late '50's. It's in fair condition and, generally, adequate to my needs. However, the tooling limitations imposed by the relatively small collet capacity is becoming more anoying all the time. I want something with R8 capability because there is so much stuff out there for that format. There are a number of options available. My question is whether the mounting flange on the J heads is the same as the mounting flange on the M's. It looks like it, but someone out there probably knows for sure. An adaptor plate could be made or a swap at the knuckle might work, but maybe it's simple once I find a J head. Thanks for any feedback.