WC dual flush button fix

Smaller button stops the push earlier which causes immediate stop of water after release. Bigger button should flush all the water. Sometimes the threshold is not met properly so smaller button can flush all the water as well.

This fixing ring moves the button up which avoids flushing all the water with the smaller button. You may need thicker or thinner ring which can be changed directly in the slicer. The model has 2 mm thickness.