Curved Folding Skeleton Stock for Folding AKs [5KU]

I installed this stock on my Cyma AKS74U
First the PRO:
It looks really nice. It's something you don't see very often. This is the main reason for still retaining 3 stars.

Neutral:
The stock is about 4cm shorter than the original skeleton stock. Might be good for Body-Armory users.

Negative:
No installation manual. It's not too hard to accomplish if you're used to work on replicas, but a tiny schema would have been nice.
On a AKS74U this stock is nearly unusable without the Cheek-Riser 5KU-351, which are not sold here, unfortunately.
The fit is a bit loose on the bolt of the hinge as the bolt-hole is a bit too wide. So the Stock is a bit shaky.
The button you have to use to unfold the stock is extremely tiny. Barely unusable when wearing gloves