Well, you could remove the gauge's pipette from the tee fitting to accurately see what it is pointing to when at atmospheric pressure. If you can get the face off of the gauge you could pluck and then set the pin back on pointing to zero so that the needle is pointing to actual pressures rather than pressures 7.5 bar

I'd always suspect the pump if a vibe pump is more than 7 years old and I wasn't able to test its flow against 10 Bar backpressure. Do you have any way of testing the pressure in the system, like one of those portafilter gauges or anything? (I still suspect the pump, but I'm biased)

I have had the Atom 75 as my first "real" grinder for 3 years. I make about 6 shots of espresso per day with it. If you want to slide the grinder on your countertops, many here have posted on various flat items to put under the grinder, allowing for easy sliding action. Ideally there should be

When it explodes is it overheating or overfilling? (Or... Is the pump running in the moment before the boiler explodes?)

Where is the water going? Is it overfilling the boiler? If so, check and clean the probe. Is it going over the OPV and back to reservoir? If so, the first guess should be a blocked "Boiler Fill Valve" preventing the boiler from filling to the level of the probe, thus the pump runs whenever the machine

I'm mainly a light/Nordic roast drinker, and I easily over roast my beans (or under-develop and get grassiness). I'm following Rob Hoos recipe, "Rob Hoos Ikawa blog post, very informative" The peak inlet temperature is 228 C, whereas light roast I often read that the peak temperature "should" be around 195-205 C. Sure, I dont know if they

1st line has one in the sidewalk sale. {link}

What a hornet's nest this thermometer has thrown at my cooling flush process. Feel like I have no idea what to do, now. Lots of experimenting to do, but painfully aware that this Taylor thermometer has too slow of a refresh rate

I've no experience with either machine, but for this amount of money, I'd be looking at a used Vectis (one is in the buy/sell section at the moment). 58mm with a much larger group, larger shot volume and better thermal stability would be well worth the extra money for me

That's true. I assume the same going the other way is true as well, if you order an O1 with a 98mm set you have the option to get a 102mm set at a later date?