Guys thanks very much for all the pointers and links to the parts diagrams.
A warm Nylon washer was the culprit. I have included some photo's of the finished product along with the roll pin punches I purchased. They were a little expensive but they make it really easy to get stubborn roll pins out. I am sure they will come in handy for other jobs as well.
This Tecumseh again turned out really well. The engine starts from 1 pull cold like a well tuned engine should. I had to move it to a new base as the old base was rusted out.
I took it for a run today and it has plenty of power and will be good for another few years mowing!
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