Thanks Ken,
A friction fit is a good idea. I take it then that the tip unscrews? I forget how heavy mine was. I made it last year, but it was a tad too heavy for single-plying the alpaca fiber in the picture. But I made it mostly for the pen function. Gave it to my sister who raises alpacas and has a store to sell alpaca stuff. Thought it would be a cute pen for the register.