Tangs - past their use by date

During my research into buying a Westsail and from the one page survey sheet sent to me by Bub Taplin a constant area that came up as requiring careful inspection were the tangs for the boomkin stays. As can be seen in the accompanying pictures the starboard tang had broken and had a dubious repair applied to it, while the port tang was cracked through the aft bolthole. Compounding the problem we found that the tangs and the stays did not form a straight line when attached to the boomkin, putting extra strain on the tangs.

Inspecting the bowsprit tangs revealed the stem tang which attaches to the staysail mount had cracked completely through. Both side tangs were OK.

Bud had suggested replacing the 1" tangs (25mm) with  1 1/4" (30mm) tangs but following discussion with the guys at Aquatec Engineering we decided to go with 1 1/2" wide tangs (40mm) and offset the aft hole to better align the tang and the stay wire with the boomkin. On a similar vein it was decided to use the 1/12" tang (40mm) for the stem area to give it more strength. Did away with the square mounting holes (another stress point) and replaced all the bolts and nuts with new stainless ones.