Hi,
That's interesting , those Sanli wheels seem to be good quality.
I took a different approach. I had a Sanli base very good nick almost new and an old full crank Victa with a completely worn-out steel base, not rusty just metal fatigue.
I cut the middle out of the old base with the 4 holes for the full crank in a circle then bolted this to the Sanli frame as an adapter plate. I had to lower the Victa blade carrier so that it would actually cut grass with another adapter. Its all been good. A Powertorque catcher will fit but falls off easily. No matter to me as I just use it with a deflector to scatter the clippings. I like the Sanli frame. The wheels seem big and turn easily making the unit nice to use.
I got the whole Sanli mower as a non-goer from a neighbour who could not start it. Complete but no catcher. I now have its Chonda engine on my 1979 Rover Regal 19.This is the third engine I have had on this base. The alloy base is still good but the alloy wheels are hard to find. Later Rover wheels can be made to fit though.
All the best
Jeff