Cut a hole in the bulkhead, and make an extension for the crank. I can get to the front of mine, and have room to spin it. Haven't tried it yet. Will take two sets of hands to make this work, as there is no way to work the compression release, and spin the crank. There is also a problem of room to get another hand in there when spinning the crank, to close the compression release levers. Hopefully will never have to find out if it will work, but may try it just to find out if possible, one of these days. For sure I don't think it's possible if the temps are below 50 degrees or so, without a way of prewarming the engine.