The product looks familiar ...

However, from other manufacturers at a price that is several fold higher. The material used speaks for quality and is no different from the design of other providers. I put the part a in a severe 200 Telezoom and have no problems either with the fitting accuracy and stability even with frequent changes of set-up.
Perhaps we are dealing with the previously undiscovered sub-suppliers of all brands provider.

The delivery time is long. This speaks for a long way until the part is in Europe.

Supplement 17.06.2015
After prolonged use, the foot can no longer secure clamping in the plate of the objective. The foot has some play and subsequently shakes the lens on the tripod. That is why now only 3 points.