Chuck:
As far as I know Alembic hasn't used spring mounts. If they have on some instruments it's news to me. The Alembic pickup mounting system is surprisingly simple and effective, in an almost elegant way. Each pickup has 4 screw holes, one at each corner. Two screws are insterted into the pickup rout WITHOUT the pickup in it, catacorner to each other. The pickup is then dropped into the rout, resting above the two screws. Two more screws are then inserted through the pickup in the corners that don't already have the screws beneath the pickup. Thus the pickup sits in the guitar with two screws at opposite corners beneath the pickup (bottom screws) and two screws at the other two corners with the screwheads on top of the pickup (top screws). To adjust, loosen the two top screws, adjust the two bottom screws to the desired pickup height (using a screwdriver narrow enough to fit through the pickup holes), and then tighten the top screws to lock it down. Let me know if you have trouble following this and I'll post a picture (unless someone beats me to it - a distinct possibility around these parts).
Bill, the guitar one