Refillable sun cream / sunscreen roller (using NIVEA roller parts)

This is a refillable suncream roller based on some nivea suncream roller parts. The nivea suncream roller is a one-way product and not refillable when empty. This design reuses the roller ball and the cap and brings a splittable / refillable design.

To get the ball out of the original design: Split the original design with a screwdriver, then you may push the ball out of the original.

The get the ball in the new part: Try to be quick! Put the ball on the top of the cap and then quickly pus