I commenced building my Sling at the elevator. It had numerous problems with a mixture of Sling 2 & Sling 4 parts, skins that were folded incorrectly, etc. Back then the factory supplied me with a replacement elevator kit. As I'm unable to proceed with the building of my wings until replacement leading edge skins arrive, it's time to build the replacement elevator. Over the last few days I've deburred all parts that will be alodined on my return from work next weekend.