That coupler looks to be worn out.

Here is what that coupler should look like. Part suppliers here in the USA are saying the part is NLA but I still got one in stock at my shop hence I was able to snap an image of it. PN 638092001 > Homelite 98795A)
[Linked Image from i1329.photobucket.com]

Last edited by AVB; 09/12/16 11:32 AM.