Hi Grumpy have got some photos for you.
The old pin is on left hand side, new pin right hand side. [Linked Image]

Assembling the decompression unit onto camshaft. [Linked Image]
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The next photo is internal of engine with all moving peices oiled and ready to go.. This is when i turned motor over by hand and checked to see if exhaust valve opened on compression stroke,,and it did beautifully. [Linked Image]

Now i have a problem. The motor we are dicussing in another thread (millers falls )was currently sitting on this mower base untill my Tecumseh was fixed (cleaning up another base for the millers falls). Tecumseh is now fixed have returned to its home. Problem, the Tecumseh is now also hunting/surging just as the other motor is..I am wondering if there could be a wiring problem on the base itself. As i never got the Tecumseh to run until now due to decompressor and with other engine hunting/surging just as the tecumseh is, it is making me think wiring. Going to do some research try and find a wiring diagram for mower and see if i can figure it out. Will let you know how i go.