Re: what do you do with the little tab that sticks up on the alpha pots?
They work great to keep the pot from rotating. But you really need to drill a small depression in the guitar body in the correct spot to fit the tab when the nob is in the correct rotational position. Don't EVER try to create that depression by hitting a screwdriver with a hammer...You may end up with a noticeable mark on the front of your guitar, or worse yet, a crack in the wood/finish.
The biggest problem with them, however, is that they are too big and blunt to just push into a guitar with relatively good quality wood. If you try to "sink" it in place by screwing the nut on, you can actually damage the pot by pulling the shaft up.
I find that just clipping the tab off with my diagonal cutters works very easily. With proper use of lock washers, the nut can be tightened sufficiently to keep the shaft from rotating without having to tighten too much, thus causing no damage to the pot or the guitar.
It would be kinda nice if those tabs were much smaller and sharply pointed so they could be just pushed into even hard woods.