Oh my, does that bring back memories! years ago I traded a beat up Model 12 20 for a Charlin, which I thought was a Darne (Darn) from a pawnshop in Ukiah California...After puzzling on it for a while, I resorted to a bottle of Good Red, from Parduccis, which was within walking distance. That dint work, so a couple of days later took it to the local "Gunsmith" What the hell is that?, says he. Decided it dint need to come apart anyhow. Cleaned the tubes, shot it badly for a couple of years. Then found a guy, Bob Enright, a custom stocker, who in 30 seconds did what Ted said. I have his picture, on the wall in the shop, and light candles to it periodicly.....My daughter has the gun now and shoots it well..