RE: GMS 47 = garbage
I hear ya. Mine was about the same, I ran it about 70 flights on my Vmar Extra, gave me fits. I had a .46 FX, stuck it in one weekend, and ran it another 240 flights or so. I'm sure the .46FX would give me the same performance today, if I'd take it down from the garage ceiling.
I had the GMS 47 laying in the garage, figured I'd get around to taking it apart some day, looking at the innards. Never got around to it, don't really know if I could find it today.
Good luck,
Dave Olson