Casa Vieja Probe II Ceiling Fan

Contact Ryobi directly and request an assembly diagram for model JS451L.

Hi Rebecca, I hope this helps;
BLADE INSTALLATION
Set the blade orbit selector lever to position III.
Push blade change button downward as far as
it will go and turn the top handle three turns
counterclockwise (viewed from the top of the
tool).
Insert the blade into blade plunger at a 90°
angle to the cutting direction. With a slight
upward pressure, turn the blade teeth forward
(direction of cut) and guide the back of the
blade into the groove in the center of blade
roller guide. Pull gently down on the blade to
seat the blade tabs in the plunger.
With the blade in the proper position, turn top
handle clockwise until a noticeable "Click" sound
is heard, indicating that the blade is locked in
place.
Push blade change button upward to its
original position (flush with the top of the top
handle), and the saw is ready for use.
Removing the blade is essentially the reverse
of the installation procedure, however, take
note that once the blade change button is
loosened, gently push the blade upward to
release the blade tabs from the plunger.

If there is a button (most circular saws have a button of locking handle) loosen the blade with an allen key in the same direction as the working direction of the blade.
BUT if there is no locking facility some screwdriver a bench vise on the blade (beware not on beside the sawteeth.
or block the sawteeth with a little screwdriver against the base to lock the movement.

OR https://www.youtube.com/watch?v=cjLHqBZGFaA
How to change circular saw blade

on a circular saw
pull the power lead from the plug
using a screw driver , place the blade between the teeth and turn until the screw driver is jammed under the plate
use a ring spanner and undo the nut that holds the blade on
pull the blade out and fit the new blade with the direction arrow in the right direction
replace the plate and the bolt do the bolt up tight
rotation will tighten it up
some blades have a hole in the blade in which to insert the screw driver to hold the blade , or a lock lever behind the cover to hold the armature shaft while changing the blade

blade brake is engaged unhook it and try turning the blade by hand should work

Usually, there is a switch on the fan housing to accomplish this.

There is a push-in lever located between the handle and saw blade.
Push in lever and rotate blade until blade locks.
Once blade is locked, loosen nut located in center of blade.'
Before removing blade, notice direction of teeth.
Install new blade with teeth going same direction.

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Hi ,
The slide switch should be just above the light fifixture and below the fan blades. Good Luck !!!!!!!!

Small black 'slide' switch up on the side of the fan body.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

remove the blade guard, should be a big nut holding on blade remove that nut install new blade, make sure the rotation arrow on your new blade is going same direction as old blade reinstall the big nut and washer , put guard back on you should be set! good luck