I just use "Mother Nature" and have a black 5 gal bucket out in the sun to heat them up, does as good as boiling them.
For the big dollar scrappers it may not be worth it to tear down but for us SIS scrappers, you get a little copper along with 3 brass plug bits.
Our yard up here will buy them as a mixed brass with the plastic/rubber still on. Somewhere around .30 lb. mixed. Sure better than shred.
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