Thing is:
The 2 trim potentiometers are to big to fit in between the other components in the cymbal's section. For TM1 I've to bend the surrounding resistors and capacitors to make space for it. And by doing that the socket for U1 doesn't fit anymore. That doesn't feel right. TM2 fits but thats simple because their's enough free space around it.
Could it be that I got by accident the wrong trimpot? On the pot it states: P254 605CO 3386
Cymbal's trim potentiometers too big
Yes, the right Mouser part must be 652-3362P-1-254LF - it's wrong in the BOM...
Aha. Thanks for clearing that up. Then I recommend they update the BOM and the building manual..