hey man- i just read about this bridge swap like 15min ago? pure coincidence eh? here's the story:
back in 1958, Leo Fender designed the Jazzmaster bridge for heavy gauged strings. that's the reason the bridge string slots were simple screw thread-like contraptions. the higher tension would make sure the strings stay put but some players prefered light gauged strings...
light-gauged players who can't stand this popping off the saddle problem, had their guitar's bridge swapped for the tune-o-matic version by gibson. it's a sensible thing to do, more importantly, the swap worked because the Jazzmaster's unit was top loaded like the gibson's. however another problem entailed: the tune-o-matic's structure waas conceived to conform to the gibson's radius... :roll:
if you are not a hard hitting player, the Jaguar/ Jazzmaster might be just the guitar for you...