I just installed a Frantz filter and used some Scott 1000 sheet 1-ply TP. It didn't fit the center post so I used some o-rings as someone suggested. What type of TP are others out there using? Anyone using TP with a center diameter of 1. 5" to fit the center, or are the newer Frantz centers bigger to fit the 1. 625" rolls? How tight should the roll be in the housing? Thanks for your input.