This might all be fun to do, but it seems like a helluva lot of work when you can buy a Pyrex glass tube designed specifically for slide guitar for $6 or $7 Cdn. I keep at least two of them on hand all the time, ever since I went to a gig with just one and dropped it on a tile floor. Had to borrow a brass one from somebody and didn't like it at all.

cheers,

david