Stihl pole trimmer head not rotating fully

Hi folks.
Stihl 145 degree pole trimmer heads can suffer from this problem.
The pin wears in the trimmer head body, it then makes it harder to push a pin in which releases the safety device which locks the blade if folded back in its storage slot.
I do tell customers about what I’ve done, and they understand as they all start their trimmers with the blade folded out.