my best method
small srewdriver to inject some window cleaning liquid :idea:
work on the grip to start to detach it
works pretty well to undo
to put back a new one , spray a touch in the grip - rub inside with your finger to spread it thinly - you may dry a bit with a cloth if there is too much
slide on the bar - it should not slide too easily as it means there is too much liquid
wait a touch so it dries