You do realize that just because the housing end isn't perfectly aligned with the tube doesn't necessarily mean it was done incorrectly, right? To me, that's a sign that whoever narrowed it most likely used a proper jig and did it correctly. I've done a few using pucks and a straight rod. They were all off by at least 1/8"-1/4". At some point, it's probably worth straightening the housing, but I never have and they all worked great and the axles slid in like butter.