Reply To: mainspring winding arbor.

[Bob Tascione]

Good to hear from you Clive!
I would certainly wait until the key gets there (or order another) rather than reducing the square size. It’s always good to keep things as strong and original as possible. Also having some larger key sizes for your winder would be a good idea anyway as many movements will require larger than a #8. You’ve got a good winder there so having a full range of keys for it would be great.
Bob