Anyone ever build a semi-automatic wire feeder like an LN-7 or S-22A or S-32S? I was just wondering...not sure if it could be done. However, after spending 2+ hours wiring in my spool gun the other day and paying close attention to the circuitry inside my new HTP2400, it looks like it might be done....drive roll assembly, circuit board, rheostat, MIG gun....something to play with. Seems like the parts would be less than the whole, but maybe not. Just an idea.