If you place an element before using PGRV on top of that element (the element needs to be on the curson) with the delete element on the right click and then press the right click while using PGRV on the left click then the element will be deleted. However, the glitch is that if you then undo the deleting of the element, (after releasing both sides of the mouse) then there is still the PGRV gravity interference. You can then use any element except PGRV and interact with the gravity disturbance without still using the element.