[Lynn Eades]

But they are not, and rubber tracks would be great, and so would a Hagglund, but what we have are ww2 carriers.
Yes, drilling to an oversize is fine as long as you can deep drill, at the same time, following the old centers, which is nigh on impossible,when the wear has slotted the hole to one side. I would guess that the drilling will be more difficult, than the casting. Does anyone know if the links were cast with a hole in them, and just "finish" drilled, or was the whole thing drilled.