The Ardumower (switch-based) bumper
[Amazon link https://www.amazon.de/z-15gw22-b-Scharnier-Schraube-Terminal-Nennstrom/dp/B072FDDKVV/ref=sr_1_1?adgrpid=74807149401&dchild=1&gclid=Cj0KCQjwjPaCBhDkARIsAISZN7TRUJwZG_uIQPjaQLS0U2O0y37If8Wtis5fvunO_QPtj53-Aznwm1caAgvTEALw_wcB&hvadid=352685680959&hvdev=c&hvlocphy=9043062&hvnetw=g&hvqmt=e&hvrand=15100421375327824719&hvtargid=kwd-301750735174&hydadcr=18529_1725534&keywords=z-15gw22-b&qid=1616770209&sr=8-1]