Advice on a drive mechanism for a homemade ring roller

Hi all,
I am in the midst of completing my ring roller. I put some pics in the dropbox...

http://www.metalworking.com/dropbox/ring_roller_001.jpg
http://www.metalworking.com/dropbox/ring_roller_002.jpg
http://www.metalworking.com/dropbox/ring_roller_003.jpg
http://www.metalworking.com/dropbox/ring_roller_004.jpg
http://www.metalworking.com/dropbox/ring_roller_005.jpg

About it: It rolls/straightens 60lb coils of 3/32 lincolnweld L-56 mig wire. (I had previously used 10ga bare copper for my sculpture, but with the price of copper lately, i thought i would try mig wire) I just run the wire through 2 4in polyurethane covered casters driven by some old bicycle sprockets and chain and through my homebuilt roller (just skateboard bearings bolted to some 1x3/8 CR bar)

My problem: I fought and fought with getting the feed mechanism (the 4in casters) both tight enough, and straight. It is nearly impossible to get both rollers to be square with respect to each other as well as tight enough to force the wire through. It actually works now, (i have probably run a couple hundred of feet through it) but it is precariously held together by vice-grips (after countless tries at adjusting it).

It doesn't really show in the pictures, but there are 2 pretty stout springs pulling down on an 12" piece of angle iron bolted/vice-gripped to the top caster to keep it tight. I also realized that industrial casters are not ideal for precision aligning, there is probably about 1/16" play in each one across the axle, which if they are not square to each other, it will drive the wire off the edge. Currently, they are NOT square to each other, the top one is tilted ~5deg (which just kinda happened, I didn't have it clamped very tight and after rolling it just kinda "chose" that "natural" alignment.

My question: Is there a better way to force wire through my roller? or should I just weld everyplace there is a pair of vice-grips?

I have a terrible history of doing things the hard way. and maybe someone knows of a better way.

Thanks,

Bryon
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