I found it easy to clamp the old FT5 to a bit of alloy, And drill through, Same with the prop stand plates.G50 is 5/16" dural, and subject to chain load, not supported by a casting
FT5 is 1/4" steel, no chain load, and supported by the primary chaincase
If there is a concern about strength, surely it lies with G50, not FT5
I was toying with the idea of buying a piece of dural plate and drilling through it. Cut from an accurate drawing would be much better.
Paul