R2 wrote: Yup on the wool silencers. I use both wool yarn and synthetic wool yarn and I’ll be darned if I can tell any difference. Some say they can but for me, not me….

I’m too deaf to be an authority on what works best to silence the sound, but I can tell a difference in how they behave.

When I use real wool, the yarn frizzes into nice puff balls. When I have used acrylic yarn, it never frizzes up.

I didn’t experiment much with different acrylic yarns, just stayed away from it after I saw that. Maybe other synthetic yarns frizz up.