I need to replace the timing device cam is worn. Have read one thread I am kind of confused about: How to replace the (Injection Pump Timing device) Stroke Curve on a bad vacuum pump 12/10/2006.

How did he get from TDC to the correct timing or am I missing something??

The vacuum pump is pretty new and works fine except the cam roller is gaulded and I want to replace it. Does anyone have the size I need and where to purchase. I saw a post on here but cannot find it. I have read every post on vacuum pumps and there are a lot. I still do not know what size the cam roller is. It should be noted that it is a roller not a bearing on a 606.910 vacuum pump. It seems to me that the information must be somewhere but it is not in the many pages I read and nothing on the 606.910 and the 606.910 is not the same as the 601, 602, 603 as it states in what I read the 606.910 is a cam roller not a bearing.

Any gotchas I should look out for? Any tools I need besides the timing lock and centering sleeve.