Even after 3 years that burl may not be totally dry, depending on it's thickness.
Personally I'd measure the width and the length--- figure which one is closest to 5.5-6.5" long (or a interval thereof, like 11-13") to get the best pen "blankage". Not a good idea to cut slabs that are 8" long and have 2" of drop every blank you cut (unless you make a TON of Sierras[B)]).
Anyhow, figure out which length will give you the best yield of 5.5-6.5" blanks, and slice it flat face DOWN on the bandsaw. Make your first cut as straight as possible. Begin cutting slabs 7/8" to 1" thick or so, and once you cut the thing into slabs, lay the slabs on their freshly-cut side and cut them same direction into blanks.
Use a T-sled on the saw or a miter saw to square up the ends.
Once all done, CAREFULLY pack them all in a flat-rate box (be sure to wrap them in newspaper so they don't crack if they are still wet) and mail them all to ME.[}
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