The reason I can’t get it to fit.
It has a rubber o-ring, which it says in the instructions to stretch into 4 grooves.
However, It just won’t stay in the grooves, it keeps popping out, making the cover impossible to fit inside the cavity.
I can stretch it beyond all recognition, where it might just grip in one or two of the grooves, but then the o-ring is now too big, making it impossible to fit inside the cavity.
And it looks unfinished if I fit the cover without the o-ring.
The o-ring was the final straw.
Two colleagues looked at it this morning and both said the same, in fact, one of them commented,
‘why isn’t the o-ring fitted in the factory … probably because it doesn’t fit.’