Only just discovered this thread so sorry I'm late...we use a seperate 10mm
Dyneema line with a snap shackle spliced onto one end, an eye splice in the other. This line is stored lying along the top of the sailbag and doesn't interfere with the sail in any way. When it's time to launch the
dinghy, the halyard is attached to the eye spliced end of the line, and the line is then pulled from the rear, over the boom derrick blocks (one of the blocks anyway) and attaches via the snap shackle to the three-point lifting harness on the dinghy (9ft Caribe
Rib & 9.8hp engine). The halyard of course is also pulled back when the line's pulled back so no threading through lazyjacks required. This also avoids running a very expensive
Dyneema halyard through the derrick blocks and causing wear right in the middle of the halyard. Works great every time.
We also have the originally supplied alloy / rubber dinghy mounts but don't use them as the
rib just wobbles around on them - we made wooden chocks which
work well, the rib and
engine sit firmly in one place and can be tied down to eyes bolted through the chock supports.