The back support is difficult to remove, but tools can be used. This model is not suitable for double-sided combs. Standard combs tend to tip forward and fall. It's better to use a guitar model, as the fasteners are bent upward. However, they are good as hooks for towels and the like.

the smallest one

I've been using the first white one for a long time. It does the job perfectly. Thick and wide phones fit. It's time to add more holders.