I've seen a lot of posts on this forum (and others) of people putting a 7548 quartz movement in a 6309 case to make a "quartz hybrid" diver, but only one mention of someone doing the same with a 7002 case. I'm not sure what the disparity in preference between the two cases is, so my question: Is this a more popular swap with a 6309 than a 7002 because of parts availability? Internal case sizing? The cache of a 6309? Something else?