Master Builder Lance Shuler (USA) made a sweet gearbox upgrade to our 42042 C model GBC 16 which he demonstrates in his video. Awesome work Lance! Get yours today at https://pv-productions.com/product/lego-gbc-16-inverse-belt-lift-module-42042-building-instructions/
Also check out his photo page: http://imgur.com/a/s3DRZ