I went to replace the 4 new homelite 12100B isolator pins in my 350 and they don't fit, the hole is too small in the case so they wont screw in. Did they use something different? Looks the exact same as my 360 but smaller hole? I'm lost because I am not finding anything but the 12100B pin. Thats the number my manual and parts listings say to use also. Any Idea?