Is there a heavy duty version of this roller?

A quick learner from St. Clair Shores, MI 48081 says:
July 13, 2010
I have replaced the wheels on my 4'door (8' doorwall) 3 times now. The adjustment screw pushes out on one side only. I have installed nuts inside (even an acorn nut on the inside end of the adjuster) but the 3/4" wide case collapses... the door is very heavy. Do you have a heavy duty model wheel assembly to replace the 81-033? maybe a double roller type? I'll buy 6 or 8 of them (several door walls). Thanks
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Paul Sr. from SWISCO responded:
July 14, 2010
If you feel you're handy enough, you might be able to adapt our 81-030 double wheel assembly. You would reverse the adjusting screw with the frame screw. You would then install the roller from underneath the door with a stub-end screw so not to break the glass. Even better, maybe pack some rubber strips to prevent breakage.
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