Hello sorlawn and GM Grumpy,

Yep, that's the one.
So it has a metal pinion that works on a reduction plastic ring gear.
Grumpy might be able to tell us how similar it is to the Diplomats (that now have the same issue).

BACKGROUND
Masport took over Morrison in 1986.
In fact their current line-up of Olympic reel mowers owe their existence to Morrison.

Yours is a modified form of that - it was a cheaper version that removed the main clutch
and triple chain transmission and plate clutch and used a transmission that engaged the
reel and roller as one.

I think the first thing to do is this (assuming no one comes forth with a solution):-
Contact Masport Australia at http://www.masport.com.au/contact/general
Upload a photo and query a parts list and parts availability.

[Linked Image]
[Linked Image]

Relevant Posts:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=35924&page=1
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=12548

Hope this helps.
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JACK.