A friend brought me a model 34 that the cylinder would not rotate when the trigger was pulled. Took the gun apart and found that the spring that hold the hand in place had broken. Ordered the spring and the fun begins, the pin that holds the spring in place is less than 1/16 size. Luckly the pin was not rusted or seized so I used push pin to drive the pin out. The fun part was keeping the spring in place while inserting the pin but after several trys finally got the job done. I hope to never have to replace that spring again.