A bracket to join two smartphone camera mounts together to allow clamping to a guitar neck... this allows you to position the camera at the ideal spot to film your picking technique for analysis!

Buy two of these mounts: https://www.amazon.co.uk/gp/product/B071XHYG5R

Two of these camera mount screws are perfect: https://www.amazon.co.uk/gp/product/B00OOLKD5I

Use some extra rubber on the mount where it grips your guitar neck, you'll have to tighten it up and you don't want to damage your neck! I had some of this rubber edging strip: https://www.amazon.co.uk/Protector-Silicone-Proofing-Pre-Tape-Furniture/dp/B08PKJYK1J ..but all sorts of rubber/silicone edge or tape protection stuff will work.

Pro tip: Don't tighten up the phone mount on the Power and Volume buttons of your iPhone because it will alarm and call the emergency services. :-/