I have the Eastwood tumbler. Most of the pictured parts won't fit in it. Plus watching it humm on a rainy day isn't nearly as much fun as wire brushing....
One improved approach though might be to use a blast cabinet.
Actually, my approach to these type of rusty parts that no one will see is just soaking the rust off with rust remover (from Home Depot). Plus this leaves a nice grey film that Zero Rust can bond to. But it just doesn't leave them as shiney...
Jim
