E-flite 25-Size Fiberglass ARF Floats - Manual (Page 19)

 4. Use a file or rotary tool to make a flat on the top
of each of the four axles.
 5. Attach the floats using the four 5/32" wheel
collars and four 3mm setscrews. Make sure to use
threadlock when tightening the setscrews onto the
flats made in the previous step.
19