Not yet, but I do have the clean out pulled apart to break loose the ash and get it all cleaned up. I bought a dryer lint clean out brush last night that should work good to get in between the fingers inside the boiler. After that I have to extend the water lines to the transmission cooler/heat exchanger I have in the garage so I can relocate that to a different spot. I'll have to hook up the garden hose to top off the water supply after that, then I should be ready to fire!
I am working on rigging up my barrel with bushings so I can pressurize the barrels and empty them with compressed air like you do. I haven't been able to find a 2" to 3/4" bushing locally, so I think I may have to order one. Looks like Pex Supply has them.
I am coming up with some good ideas for a metering pump. I will update that thread soon with my findings.
Happy burning Doug!