Hi Big Girtha,
I have a question about endcaps. I have made a few endcaps myself. The problem I had with the bigger ones, was that when I applied the weight, the extra empty space would expand so much that my glans would be pulled completely out of the endcap, and would get squeezed/crushed by the sleeve sucking in.
Does this not happen for you? Are your glans still inside the endcap after the weight is applied?
To counter this, I have always tried to use endcaps that are as tight as possible. Your messages have got me thinking that I should try making a new big endcap, but making it deeper than my past efforts.