Rhoyxon Hob's gas knob extension

Extension caps that fit on a Rhoyxon hob's gas knobs. My hob is pretty old and should probably be replaced. The gas position indicator is faded and we had a near miss when one gas ring was left open overnight.

These knob extensions make it REALLY visible at a glance, if any gas ring is left in an open position (and by how much). Because of the curved heads, there's no clip/ clamp grip. Secure with a bit of blutack or double-sided tape.

These were printed in PLA and they withstand the heat from the nearby gas rings at full tilt.