Re: spring tension - that would be my guess - also, you would need some type of adjustment if you wanted to use smaller / larger radius crowned wheels - - and utilize it on varying thicknesses of metals.
Well firstly, "models" is much too strong a word. They are...ummm..."rustic" to say the least. I mostly build "yard art" or junk art. Actual modelling is something I'm just getting into and I have a LOT to learn.
Secondly, I'll have to take some pictures of a couple of the ones that came out fairly decent, I can't seem to find any at the moment. I know I took some but digital pictures are, if anything, more difficult to keep track of than physical prints...
However, at the risk of embarrassing myself, a couple pictures of my junk art, built out of whatever I can find in my scrap pile:
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