Just re-activating a zombie thread for someone that may find themselves in a jam (literally) as I was recently. The Kent Armstrong Soapbars on a Bass Mods K7 seven string bass were too low on the bass side and I wanted to raise them. Loosened the bass side screws, no motion AT All!
I tried taping everything (pickup, guitar, Channel-lock pliers) with painters tape and gave a careful tug. Pliers slipped off and slightly marred the pickup cover.
They were stuck in there GOOD!
I looked up Kent Armstrong and sent an email to them, heard back from David at WD Music Products (their distributor?) the next morning. Very responsive. His recommendation matched JimmyM's above.
"LOOSEN ALL THE SCREWS!"
I'm reasonably mechanically inclined, but failed to realize that soapbars (and maybe other) pickups can get crooked enough in the route to lock up completely. One end high, one end low and that thing was not going to move.
I had already removed the bass-side screws to fashion a hook from a heavy paper clip to drag upward on the pickup. When I loosened the treble screws as David advised, the whole pickup nearly lept out of the bass! WHEW!
Good shout-out to David at Kent Armstrong/WD Music Products for attentive support! Now the Bass Mods seven string sounds fantastic. Raising the pickups brought out a strong piano-like "bonnggg..." that captures the lively resonance of the bass itself.
It's my first Korean bass and I'm quite impressed, it's very playable and it sounds great. I'm going to stay with the Kent Armstrong pickups, they are making all the sounds I was looking for.
Good luck to anyone in this predicament, I'm quite relieved mine ended this well.