Oscar Schmidt AP442 Autoharp Pickup

Fits a 15-C or a 21-C with a minimum of problems. If you are moderately handy you can probably install it in a half hour or so. It will also fit 36 string A and B models, but it requires modifying the chord bar holders and you MUST pre-drill the holes for the control, whether you mount it on the side of the body or on the chord bar holder. The screws are not strong and they will break easily. It will NOT fit a 23 string model. I also suggest putting a piece of thin tape (package sealing tape) across the magnet before installing - I had issues with the magnet wire coming out and if the wire breaks the pickup won't work but the tape will avoid that problem before it happens.. All in all, a good price and it does what it is supposed to do.