G'day slashnburn
That's all very good record information.
I once had to repair one of the hydrostats. I distinctly remember its
complexity - it was of the multi-piston swash plate type. I also remember
the sound of a Delco-Remy dynamo used to start the Briggs. Much more
civilised than a noisy ring gear starter motor.
Long live the Sovereign.
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Jack