[Hardcase]

Actually, as long as the stress on the steel bar remains in its elastic region, the design is a good one, from a structural point of view. Given the relative ductility of lead versus steel, I don't think that enough stress will be applied to the bar to drive it beyond its yield strength - and as long as that doesn't happen, that bar can be strained and still remain undamaged.

All stress is not bad stress. As long as the stress and strain on a ductile material do not exceed the yield strength, the material will return to its original shape none the worse for wear.

As far as the quality of the design goes, my personal feeling is that it's going to be a long haul to get six cylinders loaded with a screw-type loader. But it does achieve the goal of fitting into a small space!