Hi, Left Pedal.
Hows about an A3 size poster in a stake, plonked on the site where your machine was vandalised?
"reward $10,000
damage to heli.
here. xx. xx.xx
info. leading to
conviction will
be well paid.
contact xxx"
With a bit of luck, thick vandal's mate may think he's getting the 10K
a post, plywood, paper glue and a big felt -tip, shouldn't cost more than $20 and that may be the best investment you've ever made.
Even if you don't get a bean back,the deterrent value of being caught,is priceless.