does it allow to swiffle the hose?
Good question. This modification will
still allow the fitting to swivel. If you ever take apart one of these fittings, you will see it is made up of three parts; a retaining ring, an inner sleeve and the adapter -- as shown in the photo below. The recess that is being filled in this modification is within the adapter and filling that recess will not glue it to these other parts.
Note: this photo is of the larger D36 hose and fitting, but the parts are similar other than size and, of course, the recess in the smaller D27 adapter that is the topic of this thread. Heh, heh.