Hello all I'm very new to owning a small sailboat I bought a 1974 O'day 20ft a week ago. I have never been on or around a sailboat before this and have been going over things on boat it's winter here central Alberta so previous owner never raised mast to show me anything just said all is there. I have come to realize back stay is missing but in looking for one online I see this isn't original mast as 74 should be masthead rig this one is fractional rig and tabernacle is nothing I can find online. I raised mast with rope tied to top of mast to get length of Back stay which is 25ft 11inches can anyone tell me original back stay length overall? The overall of this mast is 22ft 3-1/2inches Any help and information is greatly appreciated.