"F.L. Whiteley" wrote in message
...
If an ASW-19 were supplied originally with only a nose hook, how difficult
to add a CG hook?


Some ASW-19s came with a CG hook. Have you removed the seatpan and looked
to see if the mounting structure is already there? Perhaps all that would
be required is to cut a small hole in the skin and mount a towhook.