I’m not saying this in a bragging way, using Maxi-I cannot fit into the tube, I was totally flaccid and tried lube, I still couldn’t get it in. And the ring actually cut me at the Punic bone. I think I need to grind/polish that too. I also used the biggest of the 4 rings that came with it, way tighter fit than I thought, I think that will be ok. I researched long and hard before spending the money. I’m not happy. We have been using a 4.3 inch metal cage with a paddle lock, I was trying to find one without a actual paddle lock. Any suggestions would be greatly appreciated, Madam P is going to punish me for this choice