I have a Western Auto Revelation Model 150M, (which if I'm not mistaken is the same as the Model 49). I've had it for over 30 years and its been a great little rifle. I took the trigger group out the other day to clean it and the little white plastic piece at the rear of the group (I'm assuming its the bolt stop) had gotten brittle and broken into pieces. Can that be replaced? Also, the hammer spring came out and I put it back in (after I dug it from behind the bookshelf), but when I went to shoot again the trigger won't pull. I took it back apart, but I don't see what could be keeping it from firing. The hammer is in the cocked position and the safety is off, but the trigger won't pull. Anybody have any ideas? Thanks.