I have a deluxe Cue smith and just got done cutting a ton of shafts. I was oiling everything up, and noticed that have a piece missing. I can not find it anywhere. The carridge that rides on the track, there is a threaded hole below the micro adjustmant dial it is threaded and has a spring and a brass block in the inside. Can anyone tell me or show me a picture of what I am looking for or what is missing. Thanks JIMM