I am in the process of upgrading the footrests in the Club Scorpio sea kayaks. I have done the first 2 this evening, and plan to do the rest over the next couple of weeks.
The existing footrests are easy to adjust without getting out, but are notorious for failing when in use. This can be a significant issue when on the sea, when it isn't easy to get ashore to fix.
The following photos show how to operate the new footrests with the lever on the back, and compare the old ones with the new ones.