I'm sure they'll hold as the outer plastic is pretty solid on these things. They will support each other to form the structure. Just don't go jumping it off ramps Dukes of Hazard style.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
I have now used these wheels over some fairly rough ground smashing their way through some overgrown kikuyu and so far not a problem so these might be a solution, maybe not the best but is a lot better that no insert at all and I doubt anybody would notice unless they were told
Ok so I'm now going back to see if I can solve this problem. I tried the cement and the right front wheel is the only one that suffered the damage so my next thought is to try ridge tile bonding cement. This stuff is extremely tough and claimed to be flexible so I am going to give it a try and see if it will do the job. I think there is a good possibility it will work fine. Still fill the cavity with styrene beads and a coating of the bonding cement over the top. Then I will have to find some pretty rugged grass area to mow to see how it stacks up. Once the wheels have been used cutting grass they look just like any other second hand Victa wheel with the grass on them.
MF, I have plenty of garbage wheels but that is what most are garbage, I pull any inserts out as soon as I get any that are any good. I picked up a couple of tubs of the Dunlop stuff so I could repoint all my ridge tiles for $45 I think it id about $37 a tub at Bunnings. If it stands up ok then even if I had to buy a tub it would make about 500 wheels I would think so more than enough to see me out. I would expect to run out of PT's before then