If you are having problems with the TSC hose/bag adapter fitting up to the TS-55EQ, TS-55R or the TS-75, you will need to clock the fitting. I just installed them on my saws and it took less the 5 minutes--total. I started with the E due to the issues I read about in this thread. When I first placed it in the cover it did not nest properly. The bore edges did not line up, I clocked it one position and the fitting nested perfectly. As I replaced the fittings on the 55R and 75 I tried different clock positions, only one nested properly.
The first four photos of are of the 55EQ, with top and bottom seam close ups. A photo each of the 55R an 75. Final photo of all of them with the new fitting.
This update to the older saws is well worth the investment.
Tom