Re: staying in tune after trem use
Yeah, stretch the strings. Just pull up on them with your hands. You'll know when to stop pulling. Letting it sit over night won't do much.
Next time you change strings, take off the tremolo, check the knife edges. You don't want them sharp as a knife but you don't want them really fat either. You might have to do a little filing.
I learned this from Rich. Before you put the trem back on, apply some ChapStick with a toothpick onto the posts where the trem meets it.
Having locking posts helps alot too.
After you've done all that, you should get a perfect return after whammy use