Was that the one which Ted Bach wanted to improve with the "broomstick method?" You cut a hole in the floor, under the collective, and insert a broomstick pointing down.
In the constant attitude auto, no need to do anything, as the machine got close enough to the ground, the broomstick pushed the collective up, beautiful pitch pull, perfect touchdown.
The Bissell company and even Hoover and Dyson were interested but the newer plastic handles weren't up to the job. And a vacuum cleaner certainly didn't cut the mustard.
