Originally posted by moos-a-boo
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Materials:
12" or so pry bars. 1" and 1 1/4" tubing. Wall thickness ?? but a good loose slip fit into the 1 1/4". 3/8" plate for the pusher foot. 3/16 or 1/4" plate for ends of 1 1/4" tubing. 1/2" NC all thread. 6 total 1/2" NC nuts. 4 total 1/2" washers.
I welded nuts into the ends of the 1" tubing to get the rim clamp and the pusher foot. To get push and pull action on the moving pieces I welded nuts on the all thread, put the 1/4" plate that closes up the 1 1/4" tubing on with washers on both sides (drill out the plate to at least 5/8" to give clearance in case your nuts in the end of the 1" tubing are not lined up just right), welded the outer nut on the all thread then welded the plate onto the 1 1/4" tubing.
I welded the pry bar pieces onto the 1 1/4" tubing and then used a grinder contour them to give a good fit onto a bare 8" rim. I then rough cut the pusher foot and welded it to the 1" tube. I ground it to its final shape so it has minimal clearance between the pry bars and the rim. Made sure there are not any sharp edges.
Hopefully this helps if you haven't already built one. This is by memory but I'd say the pusher foot all thread pushes it out about 4". The clamping action on the rim is sized for 8" but I'd bet I could get it to fit on a 12" rim. Haven't tried it on that big a rim yet.
Sorry again for not taking the time to get a few dimensions. Spending free time at the cabin an out running traps has taken priority!! Now that the daylight is coming back and the best part of winter is here my response may get worse.
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