Boroscope / Endoscope Guide Bob

Trying to feed a boroscope through a mole pipe, perforated plastic burried eavestrough piping, but the camera kept getting hung up on the pipe perforations. Attaching this bob to the camera let it glide over the uneven surface of the pipe better. I used 4 - M4x14mm socket head cap screws. Longer screws would work too. When tightening the screw down just wedge a small flat head in with the nut and it wont turn. Internal grooves to lock around the camera Fits this 8mm endoscope cam: https://www.amazon.ca/dp/B0D5R2L7GX Probably works with other generic endoscopes found on amazon and other online retailers too..Ennovor Endoscope Camera with Light, Ennovor 1920 HD Borescope with 4.3" LCD Screen, IP67 Waterproof Borescope Inspection Camera 8 LED Adjustable Lights, Flexible Endoscopic Camera 16.5FT 10M Semi-Rigid Cable