The design is very similar to the one you show, but ours has the mount
for the cradle close to the fixed wheels where yours is closer to the
pivoting wheels. So, all else being equal, ours has more leverage and
less lift height (it's plenty).

Also, on ours, the tube that the lever is inserted into is mounted on
the side, not the front, and doubles as the thing for the lock to act
on, rather than requiring an extra component just for that purpose.


I believe that these are a Cobra trolley, though I can't find it on
their website, the one I have pictures of came with an ASK-23 and is
essentially the same design as for an ASK-21. Well built, well
designed units. If you don't have the skills and tools to build one
yourself, probably worth the money to buy one and have an easy to use
cradle.

The main issue in the US is that it will cost you a fortune to get one
shipped from Germany unless there is a container already on its way
over that you can get in on.