Just something else to use on the servos to hold them in... I've found that Great Stuff works very well, and has a faster cure time. It was also easier to trim off after it had dried. When I put the servos in my 4d with the poly glue, I had to take my razor saw and work at it to get it off. When I had done my zagi a year or so ago, I used Great Stuff and was able to trim it off with just a knife.

I'm hoping to have mine flying this weekend, as long as the weather's nice... so I'll be sure to report back.