[QUOTE=Piper;6601645]I found an article on this subject that might help you. The fifth paragraph down (under the pictures of the spools of thread) should be of particular interest to you.
[/QUOTE
I have 2 Whites with vertical pegs and two Singers with horizontal. I don't think it makes any difference. I have caps that go on the horizontal pegs that holds the spools in place whether they are the wound or cross wound spools. I have never had a problem with either of them going on either machine. Just something I would say would cost more to put on a horizontal peg machine. Makes no difference to me! Edie