The thumb grips are a bit of a chore but once put in place, it's going pretty well. Note that if you have lost the original grip, they will be too big ...
Note that there is a pair of each form. But hey, you can mix directional with barbs or rings, it does pretty well.
I do not put 5 stars because it is a bit expensive for quemlques silicone tips but hey, after making the round of comments, it is those who stood out the best ...