G'day Gizmo
We are lucky that you posted a great example of Pace using two of the Thompson patents.
Great images! Thank you.

Quote
Some people believe self drive mowers with the friction drive on the outside of the wheel
to be the most reliable and robust drive unit around for a self drive mower.
G'day Max
I have fond memories (as a teenager) of using Rover 32s with Posi-drive.
They were robust and reliable - but annoying when turning.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/52544.html

I guess what 'killed' dog drives was safety, but also inflated parts costs in the modern era.
As you know, external friction drives - acting on drive wheels - were used on many
commercial slashers - Cox, Greenfield, Rover HD25; and on may ride-ons, etc.

I like well-sorted friction drive.
The North-American Snapper was a prime example of this.
A variable speed friction plate acting through a differential was just brilliant.

Max, you have a Pace side catcher!
As an option of the day, these catchers must be super rare!

[see Max's correction below]

Cheers
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Jack