Recently pick up this model 48 and it has a little problem. When putting it into battery both in single action and double action it wants to lock up about half way through the cycle, the slower you go the more likely it is to happen, the faster you go the less likely. (See video below). When I first got it I figured it just needed a good cleaning so I took off the side plate and everything was clean enough to eat off of but I took it apart and cleaned and oil it anyway and replaced the hand thinking that might be the culprit, but to no avail. Since making the video below I have discovered that if you open the cylinder and push in on the bolt/cylinder catch that it works flawlessly in both single and double action regardless of how fast or slow you work the action. Doesn't make sense to me but could it be as simple as replacing the bolt/cylinder catch, plunger and spring. Would appreciate your thoughts on this...thank you!