First, get some led weights from your LOS or use some flat washers. Lay a ball bat on your table and then lay your wing upside down over it ( just helps keep it centered ). Add weights to the high tip until the wing is level. I open up the tip, from the bottom if possible ,and add led with 5 min. epoxy, so that it doesn't come loose, right on the CG line. You can usually glue it to the last rib or tip former. Do not glue led to a plastic tip. Then just patch the hole with the " repair" covering you bought when you got your plane. Hope this helps you be "on the level". Pun intended.