This new paddle design simplifies installation and removal of the rotary by allowing the stainless steel paddle to be collapsed to fit through a standard 1-1/4 inch opening common to powder and bulk agricultural and industrial storage bins in the United States. The paddle is available with the purchase of new BinMaster rotary level indicators and can also be retrofit onto existing devices previously installed at customer locations. When installing the BMRX or MAXIMA+ rotary, simply mount the collapsible paddle onto the bottom of the rotary, collapse the paddle and insert it through the opening. When it enters the bin, the spring loaded paddle instantly expands to its full size. The new paddle is offered in two designs – a two-paddle design and a single paddle design. A two-paddle design is best suited for light to medium weight materials such as many feeds, seeds and grains or materials where more surface area is needed to apply resistance to the paddle and activate alerts. It folds to under 1-1/4 inch when collapsed, but measures a robust 7-3/4 inches when fully expanded providing adequate surface area for sensing powder and bulk materials. The single paddle design – which also fits through the 1-1/4 inch opening – is suitable for heavy or dense materials such as aggregates and is ideal when resistance is immediate and little contact is needed to activate alerts.