Quoted from jrpinball:A strong magnetic pickup tool is what's best for fishing all the small parts out of the tumbler. Get a wire "toothbrush" to clean the residue from screw head slots, etc. Looking great so far!
I agree -- get a small magnet tool at Harbor Freight or Home Depot and it's great for dragging through the walnut media to find all the tiny metal parts. Also, I find that tumbling for longer times (2-3 days) produces significantly better results than just 24 hours. Just my experience. I'm tumbling some stuff now as I get two games ready for the PNW Pinball Show here in June.