Is that an adapted mastic gun? It looks interesting. I dabbled in the past and mad devices on the more conventional design. It’s always been the head clamping part (sorry, there’s no other way to make it sound less painful, irrespective of that it shouldn’t be!) that’s been a problem; the noose design being far from satisfactory. Also, correct me if I’m wrong, but it looks as though you have the foreskin trapped rather than clamping behind the head and therefore, not a practical device for circumcised men?