I started to fiberglass one tip on the right elevator. I wrapped the outside with cloth and used regular fiberglass to go over the seam and I think with some fiber-fil, it will turn out ok. My question is how do you close off the space on the inside of the counterbalance arm? I heard you put styrofoam in the channel and fiberglass over it. Must not be right because when I did it the resin ate the styrofoam to nothing. Unless I'm using the wrong fiberglass, I don't know. I tried wrapping the cloth over and around the edge and glassed it that way but obviously that's not how you do it either because now there's not enough room for travel when attached to the HS. I'm not a glass man and could use some tips on how to do it. I went down to auto paint shop, told them what I was doing and they gave me regular fiberglass for repair jobs. Is this going to work? Looks like it'll work on the top just not the channel.