That nozzle retainer would just use a snap ring. With the way the nozzlle comes out on a angle. It will be alittle hard to get the snap ring in and out. If you was to move up in size. Like the 29mm or the 38mm this would give you more room to play with in getting the rings out. But I'm sure if you were to do it a few times. You could get them in and out with no ptoblems. Here's the last one I did. Comes in at 3.2 grams. Now you would'nt have to use them hooks on the aerotech 18mm. Cases.