Update
Updating database... Please wait.
Tuesday 21 November 2017 at 04:34
No amount of fiddling or adjustments made the helicopter work reliably until I jammed a 1/2" grommet under the friction plate. This put enough pressure between the plate and the friction wheel in order for the helicopter to turn correctly and reliably.
http://pinwiki.com/wiki/index.php?title=Gottlie...
Source: http://pinside.com/pinball/forum/topic/rescue-911-915#post-4083874