so my bass tech removed and reinstalled the electronics from my 1994 europa (which was sent into alembic for some work). i went to pick it up last night, and he tells me he couldn't get the high-pass knob back on. that it's a friction attachment (not pin), and he worked for hours on it and can't figure out why it won't slip back on. any advice? is there some trick? he was adamant not to use a hammer for risk of damaging the pot.

http://club.alembicguitars.net/Images/16271/31562.html?1158623020

Here are the directions for removing the collette style knobs. If he just pulled them off there is a chance that he might have damaged the pots so be sure to check everything real well.  
 
Keith

thanks. i'm guessing they're all damaged now.

Ow! Looks like you might need to talk with your tech about reimbursing you if the pots are damaged.

Ow! Looks like you might need to talk with your tech about reimbursing you if the pots are damaged.

pots are fine... just need a new knob. thanks for the fast advice.

Lucky escape ! That is the reason why my Alembic is maintained by me!
You want to learn then go to 'FAQ & Must Reads'/Joey's post on setting up your bass.
It is the definitive way to adjusting your Europa

I'm glad to hear there wasn't any damage to the pots.  
 
Keith