Heliguy Forum - RC heli forum

Hi guys i have a very annoying problem i can't seem to solve so was hoping someone else may be able to help ? When i first got my 500 i put a set of glass fibre blades on it and had no tracking issues.....unfortunately a few weeks later a mechanical fault brought the heli down from high up with a thud!!! not much was salvagable but the head looked ok so i reused it however since then no matter what glass fibre blades i put on the heli it is impossible to track them there is always about a 20mm gap between the two blades if i adjust a blade linkage rod then the blades just swap positions ???? But if use Align carbon blades they track no problem at all ???? however i'm now starting 3d flight and have had two crashes recently which both destroyed the carbon blades so at £40 a time it's getting expensive.....So i just bought two more pairs of glass fibre blades from a completly different supplier and once again cannot track the blades ?????? My question is does anyone else use fibre blades and can track them ?? Do i have a problem with the blade grips or metal rotor housing from the original crash ? but if i have why do the carbons track ? This is soooooo frustrating any help appreciated ( Blade type as below )