Thanks Norm. I'll look into it. The Snapper Commercial mower looks impressive.

https://www.snapper.com/na/en_us/product-catalog/push-mowers/commercial-walk-mowers.html

Snapper's USA website mentions a disc drive system, but Victa don't give any details of theirs. However, since both companies are owned by Briggs & Stratton, there is a strong possibility the drive mechanism is the same.