Help! I just inherited my grandmother's 401. It has been sitting for probably 20 years or so. I oiled it last night with triflow, and greased the gears. This morning I plugged it in for the first time, and sewed a few straight lines. The stitch was beautiful, but I noticed a small amount of smoke rising up from the machine I took the top off, and watched it while sewing. The smoke seems to be rising up from middle hole of the cam stack. I didn't notice much of a smell.
I took the bottom cover off, removed the black metal guard, and looked at the wiring that was visible. It seems okay. The wiring that I could see at the top looks alright too.
I am scared to sew with it anymore, until I can get this figured out. Does anyone have any suggestions?