GarySS,

It's pretty easy to cut the entire batt or servo completely free at the surrounding EPP. Then you can just graft in a new block of EPP with the Gorilla glue then sand it all smooth and flush when it is dry. No biggie. Ck the SPAD guys for how to paint coroplast...

I made my own control horns out of square PVC tubing so they have a bigger footprint on the coroplast surface and I've only had flutter once or twice in a year of flying, but I mostly 3D it...

You gotta try the skis on this- It is a kick!

Bill
4D over 1 yr old, still going great.