[John Sabato]

Welding and re-machining a Luger frame to original specifications would take an extreme amount of work and getting all the subtle shapes just right would require a real artist with a torch... and a full machine shop. I would venture to say that it would be VERY expensive procedure...

The simplest way to restore a stock lug would be to obtain a damaged frame and have a "stock lug-ectomy" transplant operation. It would take much less effort (read that as much less expensive..) and final finishing would result in a much nicer final product with all the original grace and engineering intact. Since the all-matching gun has already been altered by grinding the lug off, repairing it should not depreciate it's value at all, and will likely increase it's value as a shooter.