[QUOTE=Houze66;485252]I have a Luders 36 ketch, wood masts; the stays are 3/16" and in good condition; but I wonder if I should go up to 1/4" stays? I do not know the wrap/core count of the existing stays. Any advice?[/QUOTE]
Houyze66, there is a guy right there in Phoenix who can run the numbers for you and let you kow if you should re-size. Generally it is not a good idea (for a lot of reasons)
Also he is very good at discussing any rigging you might want to change.
John is available by phone most any time.