nylon thimbles

[benz]

Thanks: I like the closed top of the nylon ones--it's hard to find that feature in stainless thimbles of a large enough size, and the open top and associated edges right at the throat of my splice make me uneasy, especially using rope instead of wire. I like the idea of solid ones with pilot holes, where are those found?
Has anyone tested whether nylon ones deform at lower loads than stainless? I can't imagine the squeezing force imposed by the eye trying to flatten out is that great.
Ben