Yeah, I ground a few grooves inside the handle with my Dremel to mirror the grooves I filed in the portafilter handle (very soft casting so easy to do) so they would key together along with an isopropyl wash out before I epoxy'ed the hell out of it.
I'm quite brutal with my knock out of pucks and the handle is perfectly fine 5years later.
It is a poor design to start with though.
Sage sent me a new portafilter!.... for a Bambino, and it doesn't fit on the Barista Pro (the top of the handle collides with the group head). They are sending out another one today.
In mean time, I have repaired the old portafilter. I roughed up the tang on the filter holder with a centre punch; I was going to drill some holes through it, but I don't have any bits that are suitable for stainless steel. I also roughed up the inside of the thermoplastic handle with a dental probe and cleaned it all with isopropanol before applying liberal amounts of food grade silicone. I used elastic bands to hold everything together and let the silicone cure for 24 hours. The portafilter feels as good as new
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