I too am interested in the choice between transom or twin tail mainsheets.

I am contemplating buying an early fibreglass GP (sail number in the 9000’s) which has a horse integral with the aft deck.

Would it be possible to fit a centre mainsheet block on the aft end of the centreboard case and then convert the main sheet to  a twin tail system? Would the top of the fibreglass centreboard casing be strong enough to take the load and would there be enough thickness of material to take long enough screws?

Any comments or observations would be greatly appreciated.

Thank you

Ian R.