I busted the adjustment screw out of an ALDA. The unit no longer sealed (manifold pressure not transmitted to IP) and had virtually no function. As a last resort I packed the vacancy left by the broken screw with muffler patch. By some freak stroke of fortune it functions well now. The turbo and IP work together to supply good power. But the whole ugly mess could have been avoided by me not monkeying with the thing in the first place.