The bracket is riveted on and the other side will be under the putty but leaving that alone there will be a nut behind the centre pin, can you just not replace the handle and leave the bracket alone?
So guys if any1 wondering in situations like this you better be leaving alone bracket (if u can of course) as dude above said. But if you still want to replace the handle you start by gently prying off the cap with a flathead screwdriver, as it may hide the screw underneath. If the cap doesn't pop off, check for a small hidden release pin or clip at the base of the handle—press or slide it to detach the handle. Finally, if it's still stuck, the handle may be secured with an internal mechanism requiring a pull-and-twist motion to release it from the spindle. This works for most crittall window models btw (i tried myself)
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