So my trusty LPL 4500 enlarger has started going out of alignment a lot. I'll resize something and side to side alignment is toast. I've discovered the means of aligning the lens stage, but I'm wondering what long-lasting fix there might be. I got and used this enlarger for years because of their reputation for being "permanently" aligned and was not disappointed for years, but now this is just as bad as my Beseler was. I've tightened my column to baseboard screws and the problem has not gone away. I'm using this for 35mm and 120 negs only these days, and when I even go from making contact sheets with 60cm of height to making 8x10" prints with 36cm of height with the same lens the enlarger will be off slightly. Every time I move to making 16x20" prints I have a machine way out of alignment, whether I change the lens or not.