G'day Ian,

Yep, your comments are good stuff for the record.
Perhaps Rega made the whole shebang for Singer to Singer's design (?).
I don't think we will ever know that...

The issue of the PTO is a moot point.
My current opinion is that it was offered as a retro kit that could be easily fitted to your base.
Below, it is shown driving Kit No. 2 (the compressor).

[Linked Image]

All very interesting.
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JACK