I've made a new chaff collector by cutting out both ends of a tin can, drilling a 2" hole to fit over the glass chimney, and attaching 2 bags made of wire window screen (one to each end of the can). I also punched a hole for the temperature prove positioned so that the probe rest about 1.25" above the roasting bottom. Here's what it looks like:
The wire bags should provide plenty of surface area for chaff collection. They can be emptied by using a vacuum. The bags are attached with an outside twisted wire loop. I also taped the assembly with high temperature aluminum tape, not the stuff that failed.
There is a trick to forming the bags. I folded the wire seam over itself a couple of times so the portion given to fraying is inside the fold. Then simply use a stapler to 'bind' the seam. What it lacks in pretty it makes up for in quick/easy/effective.
I also added some twine as an insulated handle to the glass chimney in case I need to remove it to dump the beans for cooling. My current cooling plan is to turn off the head and run the fan for 4 minutes on full.
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