VW Clutch Cylinder Test Plug

...so you VW clutch has gone kaput and you don't know if its the "master" (easy change) or "slave" (gearbox out) ...

Print one of these, (you need the o'ring) use it to split the circuit at the breather/vent valve. You can test master - see if keeps pressure - if it does,bad news, it's the slave
You can also test the slave, if you have a simple vacuum bleeder, just swap the the plug end

Print small face down, narrow layers, with support to keep the sharp edges

Here's wishing you its your master!