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I've got a question, is there a reccomended method of cleaning the stock oil bath filter on the M-37, or should I look for a new one? Is there a kit for a replacement unit using a paper filter like the one for the Jeep MB or GPW?

Thanks in advance

The time-honored method of yore (i.e. "in the old days") was to wash the mesh/screen with gasoline or kerosene and blow it dry with compressed air. The "bowl" could be wiped clean with a dry rag. (There will be a bunch of crud in the "bowl" if it hasn't been cleaned in a while.) After everything is clean, fill to the mark with fresh SAE 30 oil and you're good to go.

Ok, so just soak the whole unit in gasoline? I noticed a marked improvement in power while at idle with air filter off, so I think it needs a good cleaning.

Sure sounds like a good cleaning is in order! You'll have to soak it, swish it around, pick it up and let the gas (or other solvent) run out any number of times, but eventually all the gunk will come out and you'll get clear solvent running out. Then, blow it dry or let it sit in the sun for a while and reassemble the unit. Just be very careful. No smoking, grinding, welding, etc. anywhere near the solvent bath! We wouldn't want you to go "whoosh!"