People go to Chicago for fun?
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One of my 2-speed transmissions has been hard to tune because it spins slower than the stock springs were designed for. I made softer springs and that helped, but it still wasn't quite enough. So, I did a little research on metal densities and dug around on Amazon to see what was available, and I bought myself a copper-tungsten rod. Copper and tungsten can't be alloyed together for some reason, so what the rod actually consists of is 70% tungsten dust glued together with 30% copper; the result is a rod that looks like copper, bends like copper, cuts and grinds like copper, but weighs nearly as much as tungsten. I cut it up to make some centrifugal weights to insert into the clutch shoes in the 2-speed transmission, to increase the centrifugal force when they're spinning so they can overcome the spring pressure and engage 2nd gear at a lower RPM.
Also, I took a picture of a cross-stitch project my girlfriend just finished:
Check out "Fyrstormer's Garage" in the General RC forum.