I have a new lace flyer from Ashford.

Anyway, it has some vibration when spinning (30:1 or 40:1). When I analyzed the reason, I made some conclusions.

It is not necessary to rebuild something, just turn the hooks so as at the picture. Not any position, only this one. You will see the vibration will be less.

Why it is so? For people who know the physics, it is easy to understand, just remember “Parallel axis theorem”. For other is it difficult to explain.
Just do it and enjoy!!!

PS: It is also necessary to control you flyer for common balance: http://www.ravelry.com/projects/BlackMary/how-to-balance-...