Hello fosdick

The answer is - this is a Morrison, but based on a Ransomes' design.

New Zealand's Challenge Corp. acquired Scott Bonnar (from Electrolux)
in 1973. Between that time and 1979 (prior to the Rover takeover)
Challenge Corp. (who owned Morrison) re-branded 16" and 24" Morrisons
as Scott Bonnars.

[Linked Image]

Yes, the clutch works the opposite way.
Converting the clutch to a SB 'Hair Trigger' would require serious modification.
No one, to my knowledge, has attempted this.

The clutch is covered in my Victa Imperial article.
I agree, the landroll speed is too fast, particularly if
the primary (centrifugal) clutch shoes are worn.
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=72729

You should be able to find other info. about your machine by typing in
'Scott Bonnar Morrison' in the blue search bar (above, top).

Hope this helps.
-----------------------
Jack