Gary & Ian,
My gypsy accomodates 3/8" and/or 10mm. 10mm is 0.39". 3/8" is 0.38"
The gypsy was either designed to take either 10mm or 3/8 or the
difference is so small that it makes no difference...I am going with
s/v BeBe SM2 #387
In firstname.lastname@example.org, "Ian Shepherd"
supplied for the US market might have an imperial size of chain. Iknow that
when I was on the East Coast I did experience difficulty in getting10mm, so
I bought a new gypsy and used the US equivalent (3/8th"??). I amnot sure
about this but if you take the gypsy off the windlass you mightfind a size
marking on the inside face perhaps?