73custom, you do not need to buy expensive stuff from SM. I'm using the same 0.5" trim bit and I realized that the 3/8 bearing doesn't work for, so I have ordered online 5/16" bearing for 3/16" shaft which give me .09" , and I paid $4 for the bearing.
Greetings from NJ
Where did you get the wiring plans?
Can post them?