That is an interesting way to do it. I was surprised he could get the weight through all those turns. The way it is done in a repair shop on modern baris is to remove the "pigtail" by removing the necessary screws and keys that are affected. When the part is off a flexible brush is run through the part with a cleaning solution followed by rinsing and drying. It is not for the "faint of heart" but just about anyone can do it with a bit of logic and care to put it all back the way it was. On older baris the part needs to be unsoldered which is best left to a repair tech.
Grabbing you bari by the bell and shaking it like that on a regular basis is going to create leaks in those low notes. I prefer using the Hodge bari swab that goes in from the top. I probably have a small build up where the reach of the swab ends but I'm sure I don't have the crap in my horn that he pulled out of his.
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