Any deer hunters will know the trick of rubbing a tree to mimic the sound of a deer rubbing it's antlers on it to mark territory.
A stick is the usual tool I thought, it was suggested to me to get a bit of antler and do it with that for a more authentic sound instead.
I could pick up a length of antler for $40 or $50 or whatever so it's not a big investment.
Reckon it makes a difference though? Worth bothering with?
It's not so much the cost, just carrying it around all the time for no reason is the concern. If a stick will do the same job...