A GO500 never enter with strength

I would have expected a cover, from the same manufacturer that the device to which it is supposed to be done, offered enough play to slide the device without requiring force.
My first impulse was to return it as too small. As some comments seemed happy, I tried again: being careful to slide the device between the beads on listed species, the unit goes without using too much force.
But I still find that this case is misconceived, since slip the device without folding the hems at the same time is not possible.