Just as a little side note.
When you fly as an instructor in the R22 after someone has flown without the duals make sure they have ALL been replaced properly.
The collective can be replaced without the pins locking into position. Then it gets covered with a neat little hat.
Suggest a sharp pull to check that it doesn't come out. The first practice auto isn't the time to find out that it actually pulls straight out!!!
You should have seen the original design before the locking pins..... now that was easy to do wrong