I picked up this high-mass Warwick bridge at a great price on eBay a couple weeks ago (hasn't arrived yet, though). Assuming the seller doesn't back out, I've got a decision to make. I'm working on two basses right now. One is a new SX jazz, fretted, and will have EMGs installed. The other will be an SX defretted jazz neck on an Aria Pro II PJ body, which will also have EMGs when I'm finished. The APII body is noticeably heavier than the SX jazz. My question: which bass stands to benefit more from the bridge upgrade? I've also got a Warwick adjustable brass nut on the way, and I'll need to make a decision on that one, too. One last thought is that I could switch the necks, and put the fretted neck on the PJ body and the fretless on the J. Your thoughts?