Heat both sides of top with 2 2"X9" heaters part # 5428 Kapton or Rubber, 24AWG 154, 77.7, 46.8, 21.6, 14.3, 10.6 ohms available. Effective area 17.22" 5428 KA $35.90 KB 39.50 RA 22 RB 27.50 rubber lead time, 4 weeks with adhesive Get CT325TF2A5 controller, need Thermistor, want up to 50 watts power, unit can provide 240Watts. Unit has 4Amp max, open drain. I^2 R = Watts What does this mean? Must provide resistor to limit current? Is ouput voltage = input voltage? If so, than say 40V supply and V^2/R= 50 Watts so want R= 1600/50=32 ohm. Right? Bearing Support is 1.25" dia X 3" high, want ~3.875"X3" Part #5465 is 3"X4", should be fine. 62.1,30.9, 19.4, 8.6, 5.7, 4.1 ohms KB 35.50 5562 for goinometer KB $31.55 Goniometer thermistor part # TS665TFY40 (a=without, b=with stickem) .20 X.47 X 0.079 inches 14.80 #15 epoxy 2 componet $10