These snap right into place but you have to keep snapping them into place as they are just a tiny bit larger holed than the originals. I ordered them because one of my heli's broke its main blade holder and was relying solely on the connect buckles to fly. This wasn't a good thing as the connect buckles wore quickly and the heli didn't fly right.  I borrowed the originals from another heli to try to keep it flying as its my girlfriends favorite heli that broke and replaced the ones I stole with these replacements.  Now I hav4e to keep putting them back on as they just that tiny bit to big.