what needs to be done after putting a new roller in my timer old one had lots of wear in the roller this is my first t a 1921 depot hack
Make sure the races in the timer body are not wavy. If they are, I doubt if you'll get good performance even with a new roller. The races can be cut or ground using a lathe to reestablish a perfect surface. I've used a cutter, but a tool post grinder would be better, methinks. I've used a four jaw chuck, some folks have fixtures to hold the piece secure. If you don't have access to a lathe, it would be wise to replace the timer body when you replace the roller. BTW, use plenty of light grade oil and keep it clean and well oiled. Some use light grease with success, but I have found oil to be a better bet.