Inside the arm unit there is a washer set you can get to fix leaking valve. Also check for what V you have. Looks like a v1 or v1 so make sure parts for that version if you have it.

I fixed my leaky stream arm with a service kit for it, insulated the boiler with high temp silicone and cable ties. Re-did a few wire and connectors and got the IMS shower screen and grided the bolt for it to sit much flusher.

I had a used grinder too but nothing but issues, got me a 1zpresso K-max and cant be happier (you might like the J-max though)

Lastly I used a makeshift pressure portafilter to make sure im at the right BAR

As for mine (insulated) I just wait 40 seconds after the boiler light goes off and that suits me okay. You could be different and might have to learn the right time or do the temp surf.

Best of luck

Something that can still be bought also should be the main thing.

Seems like this sub needs a name change sometimes, like "bought it for life" or even "inherited it for life".

But main sad reason for that is that the companies making those products stopped making them as good or got bought out.

Too bad they have destroyed the recipe and sell us trash flakes for the past decade....the last year they finally because non edible for me with yet another change.