Because of a lack of these crowns, one is tempted to buy also suboptimal parts.
I bought this one, it looks good from the measurments 6.75 x 3,7? with stem size of 1mm.
The thing shows two problems, first a part of the tubus seems to be fixed in the crown and the second
problem is, that the thin pipe with the 1 mm thread in it, has loosen up. It doesnt fall out, but it can be moved
in laterally direction.
Is it possible to repair this or have I bought it in vain

 

If none of these problems were disclosed, I would send it back.

 

Are you kidding, he got that extra fragment of tube thrown in for free. Bonus!

 

My guess is the "tube fragment" is actually the hardened O-ring from inside the crown, but the picture isn't great to see a lot of detail. The real problem is the post being loose on the cap - not sure that's a fixable problem...

 

@Gefa, I was joking, of course. You should definitely return it if possible.

 

... .. Yes of course ..

 

Just glue it on!

Or fasten it with a paper clip...

 

... Thanks for your comments, I will send it back