No draining but no blockage???

[alefromitaly]

yes...it's proper..I repaired a siphon (brass) with the problem that you painted in your last photo..

 

[alefromitaly]

also your think zanne,has sense..I would like be there for study and find a solution..
:banghead:

 

[Zanne]

You're probably the only person I've met who ever said I have sense. JK
Ok, I know you really mean that my idea makes sense.