I will look on my loft if I have have still one and give you the measures. But why don't you take the measures from the mastbase casting and make a model from cardboard or wood. And make then one from St 316.
ronald RAIDER-15 (homebuilt)
hey boy, what did you do over there, alone far out at sea?.. "huh....., that's the only place where I'm happy, sir.