I have to say this device works well. I've installed a boiler plate three times now. After being instructed by members on the forum on how to use it on the 4x4 plate system, it shave considerable time down on the plate install.
The first two times I tried to install the boiler plate without using the wunderbar (at least correctly anyhow), it took all evening for each setup to get it done correctly. I think it took me four iterations each time to get everything aligned.
The third time, now knowing how to use the wunderbar correctly, I managed to get the plate install done in 40 minutes. I still had a few iterations taking the plate off, loosening and re-snugging the bolts down and checking axle alignment, but it went a lot smoother doing this, re-snugging the bolts down with the wunderbar in place. The wunderbar keeps everything lined up while you are snugging down the bolts, reducing any axle-plate shift while the bolts are being secured.
Thanks to all that helped with the correct usage of the Wunderbar. For those un-knowledgeable about this, it fits in the center of the 4x4 plates, NOT in the axle holes (which is where I inserted it on the first two attempts) :-)