I have a homelite mightylite model#UT21506.The problem that I'm haveing is when I reinstalled the recoil spring and spool with a preload of 3 turns I can not install the 3 retainer tabs without it jamming the assembly.It's almost as if the assembly is not seating deep enough in the caseing.Normally a recoil is the easyest thing to do but this one is driveing me nuts.Any help would be apreciated