I just installed a set of SD 1/4 lb pickups in a MIM P Bass I just bought. The problem I am having ,which seems to be common with p bass pickups, is the back pickup wants to tilt backwards towards the bridge. The front went in and stays straight, but the back pickup tilts backwards towards the bridge. I can firmly push it forward, but I can't think of a good way to keep it pushed forward. I used the foam from the original pickups because the little rubber tubes that come with the SD pickups seem to be useless. Any tips? or is the tilting not really a problem?