Hi Cassiar

Sorry for the late reply sometimes posts can slip through the net but hopefully this will answer your question. The grips inside part the part that fits onto the handle bar] have a button/bubble of plastic inside that is there to hold them both in place when fitted. The problem is that if the handles are removed this button is sliced away and after that they wont stay on.

The other thing to note also the grips are not a tight fit on the handlebars which can give a good deal of movement, the cure I found for both of these problems is to put a spot of superglue on the handle bar and then gently push the grip onto the handle bar until it is fully seated hold for a few seconds till the glue goes off and that should stop any movement and hold them in place.

Best regards

Andy