Mount for the MTB Handlebar

The idea was to make a more or less universal holding element to mount a portable speaker to a bicycle handlebar (designed for a standard MTB 22.2 mm handlebar diameter).
Speaker housing fastened with a M4 30 mm screw.
Update 1. Updated with the slightly modified version for SBS-plastic.
Update 2. The previous versions cracked when I fastened too much so I've just updated with the slightly modified version for ABS-plastic. I recommend it.