I think I gotta agree with sweetpea also.
I mean we're talking about a little money and a little work for our very expensive planes here.. It's so easy to do why wouldn't you. I don't know, but I dont want zero gap. Ever. That is where servo strain comes into play. I'm not trying to put any more resistance on my servo's than I have to.

8178, maybe that zero gap works on a kwik fly with an 1/8 balsa stab for that builder, but I don't think I'll transfer his build tactics to my 2 meter ships. I'm not going to give any of my planes a reason to flutter. I seal all gaps on all planes. It's easy and I have never once had flutter in any plane since I started sealing the gaps.

My .02

c ya