The handle of my portafilter has become detached (too much banging on the knock-box; I realised too late adding a bit of water on the puck after pulling a shot solved this problem!) - can anyone recommend good ways to reattach the handle?

I no longer have the thin plastic sleeve that sat between stem and handle, so fit is a bit loose. I'm assuming this may be able to be replaced by using a suitable adhesive to also fill the void, but looking for recommendations. I previously had it attached using Araldite (using duct tape in replace of the sleeve) but that gave up the ghost a few weeks back.

Thanks for any ideas.