At 04:02 08 May 2014, wrote:
"Why is anyone aero towing with a tow hook that will back release?"

Some of us don't have much of a choice. For example the two ASW-19's and
tw=
o ASW-15's at my field all have both a C of G hook AND a forward mounted
ae=
rotow hook. The forward hooks have a back release function as well. Short
o=
f engineering, building, installing and getting an STC from Transport
Canad=
a for a completely redesigned forward hook mechanism there's not much we
ca=
n do about this.=20

I had for a time an ASW17 which has the same release arrangement as the
ASW15,19,and 20. There was a wooden block attached to the rear of the
aerotow release aperture which prevented operation of the back release. It
never crossed my mind that this was not how it was built. It was
effective.
In the days of yore it was common practice to use bodge tape to prevent the
operation of the back release when aerotowing.