Thanks to Acornhill I was able to replace the piston and cylinder on the 3400 today. I thought I remembered that the bearings and seals are the same as the PTO side on the 10 Series McCulloch saws to I decided I might as well split it and replace the seals while I was at it, good thing I did.
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There was about that much packed between the bearings and the seals as well.
It was all going back together well until I noticed this...
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I will know the next time to take the oil cap off to prevent anything like this happening again. I now have more practice splitting the case, cleaning off threebond, you get the drift.
I spent an awfully long time trying to remember how the throttle & latch went together but I have the rear handle together and will keep plugging ahead.
Mark