N5 specific pre-flight check

[debrooker]

I may be teaching people to suck eggs on this one, but after a servo failure on spool up and a slight topple, I was having some slight erratic pitching in flight. After doing some head adjustments last night I noticed that the elevator arm was slipping a couple of mm.

It seems now the grub screw does not have enough purchase anymore. Matt Botos does mention this specifically on his website, so I was able to rectify quite simply.

Just thought I should highlight the need for this check