I find the money in the unit does not again, now that's maybe an occupational disease (I run a locksmith). There are easiest 08/15 bearing, with standard dimensions installed 2 tubes, a plate and a cast ... all made of aluminum. Processing of aluminum top, painted clean and makes a stable impression. Disappointed have me the plastic parts, which are very very cheap, but still keeping thankfully.
Overall, the whole makes a solid impression, but production costs, perhaps 5 in Germany. I am superior if I re-send the frame back and me here in the workshop easy to build.