Rob Hoos sets airflow at 100% from the outset on his 3Kg USRC roaster. At least that's how I understood that point in his paper on tipping. I do that now on my 1Kg propane drum roaster and get very good results, applying consistent heat without tipping. It helped to get used to a fluid bed sample ro...

It's hard to tell whether that's rust or brass showing through where the chrome was removed by intensive descaling. With the siphon tube, you could try seeing whether Evaporust removes that coating. If not, it's copper. But it looks rough rather than shiny. I think someone mentioned earlier in the t...

Agreed. I've never had a siphon tube look roughly red like that. They're either black with oxidation or pink, smooth copper

I can take a photo and measurements for 3D modeling, but we should also compare my trier to Eddie's. A spare part of a North or Mill City roaster could be hard to obtain without a special order from the manufacturer. An alternative is to find a pipe that fits the insert. BTW it really helps to have ...

Do you have a rusted siphon tube? Also, BTW, if you do lots of descaling, that doesn't necessarily clean coffee oils in tight and remote places

Me too, if you'd like. I'm across the river from you and have a TJ-067

Since no one has asked this yet, how do your roasts taste? Are you happy with your results? As far as BT ROR goes at the very start of the roast, that's when the beans are full of moisture and there are few chemical reactions happening. You're essentially building pressure inside the bean and heatin...

Did you just score that on eBay? If so, it was quite a deal!

This may have to do with the slow pace of the roast for this machine. Keep in mind that a drum roaster has much lower air flow. Maintaining those temperatures over that period of time drives a lot of heat into the roast. I would try reducing the length of the roast by a minute or more and

Good luck with this. Piston gaskets can tear or degrade or may just not be a perfect fit. Or they can be installed facing the wrong way. Also if you can't taste solvents used in the past, that would be ruled out. Some solvents or lubricants can degrade some piston gaskets. You might make sure there ...