Gullsweeps do not fly as they do not have any lifting component; and they do not float either. A retainer is not only for peace of mind but can prevent a lost Gullsweep in that unforeseen situation.
To install, slip retainer spring up on center mounting pin. Put Gullsweep on mounting pin and press all the way down so it is resting on the center pin. Adjust the retainer spring so it is in place over the hub retainer
ring with a minimum 1/8" clearance above the hub retainer. The
spring should not touch the hub or the retainer ring. (See diagram).
To remove, pull back top of retainer spring so Gullsweep can be removed. Spring retainer can stay on the mounting pin, however the pin should be removed if it can be dangerous to anyone on