We repaired the bent wheels! The front two wheels suffered under the strain
of hoisting the concrete blocks! We were (and still are) loading 10 blocks on the trolley (this weighed in at about 270kg!) and that started the problem but really it was when we put on 13 blocks (a total of 351kg!!) .. that did the real Damaged!
I welded on some extra steel pieces to reinforce the axle to the
flange of the wheel. We only hope now that the ball bearings will survive!!!