[jolsen42]

I don't have the Trigo wheels, but I do have Compomotive pin drives. They use the same adapter plates that Trigo uses. When first attempting to mount my wheels I discovered that the threads in the locating pins were not drilled concentrically. I went thru four sets of pins until I was finally able to mount the wheels. Even then I had to draw them on with the spinner. The rears Go on rather easy but the fronts are really tight. To see if your studs are drilled concentrically, thread them on slowly and watch for any side to side movement. If there is ,then they are not threaded on center. I hope this helps.
jolsen42