Swivel and quick release adapter for monstertech chair mount

[Speedy_]

Hey,

Following a DIY project for a monstertech style chair mount, I have some adapters left over.

I ordered the 3D printed parts directly from them but had to buy more unit than needed to make shipping worth it.
Sourcing the missing parts of the kit on my own turned out to be cheaper :
 - Tightening levers
 - Star knobs
 - Axial ball bearings
 - Washers

Mounting is not strictly the same as theirs, but it works flawlessly.

Here is the 3D printed adapter plate along with the inlet and one of the two ball bearings needed :

Here is the whole kit along with the sourced parts :

Here is the kit mounted on the chair mount plate  :

I've got 6 3D printed adapter available, enough for 3 stick+throttle set.

I'm asking either for :
 - 15EUR/unit for the 3D printed adapter alone (or 25EUR for a set)
 - 20EUR/unit for a whole kit (or 35EUR for a set)
(Based in EU, shipping not included)

Keep in mind that I don't currently own all the tightening handles, I would have to order them before shipping. Expect a 3weeks delay.
Otherwise, I'm open to give away the specs of the missing parts so you can source them for yourself (~5EUR/unit).

Cheers.