Solutions:
a) Make sure you are using the longest sidebars, allowed by your current penis length
b) Push the plastic front piece toward yourself, making the springs press home, before fixating the gland with the silicone band
c) Make sure to leave 1mm space between the thumbscrews and both the plastic ring and the hexagonal pistons, before expanding the length by turning the screws inward. The thumb screws should in other words, expand on both sides of the screw finger handle.
Caution: Do not continue turning the thumbscrews inward, when the screw has expanded to the maximum (thread becomes visible in the ends). This will cause the ProExtender™ to disassemble!