Been through a few different spreaders over the years - all crap.
They either spread unevenly or bog up with fertiliser and take ages to clean out/get working properly.
They give grief if the fertiliser gets damp or lumpy, or the grains are not perfectly equal in size.
Tried the ones with crank handles, feeder wheels, feeder drums, variable opening screeds - sorry, all crap.
In the end i always go back to a 3 litre square P.E.T. juice container.
Cut the bigger side down the centre and off to the corners, then open it up like a set of double doors.
The "doors" work like filler flaps when loading in fertiliser.
Hold the container by the #### (bottom) with the open screw top lid pointing away from you.
Shake the container from side to side to sprinkle the fertiliser out the lid.
Vary the angle, height and shake to vary the spread and flow rate.
Faster, more accurate, better control, and way more reliable than anything available from Bunnings.
Plus you get 3 litres of fruit juice free.