Starting pawl for Mariner 20HP

Hi There.

I've just returned from a fishing trip at Loch Etive - caught one Mackerel !
My trusty Mariner failed to start for the return trip. I managed to drift to
the shore where I was able to stabilize the boat and set about investigating
the problem. I discovered that the spring operated pawl which engages with
the starter ring had worn and was failing to engage. Every time I pulled the
start cord, it shot out without engaging the ring.
I finally managed to start the engine by manually turning the flywheel and
pushing a screwdriver through an access hole to trip the pawl.
This let me pull the engine round on the cord. It took a few attempts, but
when the engine fired I kept going until I got back to the launch site.

Does anyone have any ideas where I might look to get a new pawl?

P.S. My backup Seagull engine refused to start too. I'll need to service it
too.

Cheers Davy M.