The clear quartz gem foot (sometimes called the crystal boot) attaches to all Omnivos and Biosonics tuning forks. People use the gem foot to amplify energy and vibration transmitted but the tuning fork. It is best used with weighted tuning forks. The smooth crystal makes it easy to smoothly slide the tuning fork along the body while it is vibrating. Recommended for the Otto 128 and Om 136.1. The clear crystal quartz come from Madagascar. The base is made of non-magnetic stainless steel. We have see several attempts from other companies to produce this but non are better than those made by Klangschwingung in Germany. The gem foot comes with a small hex wrench and screen to secure the foot to your tuning fork.

Product Link

https://www.omnivos.com/clear-quartz-gem-foot.html?ref=frequencyfamily