+++ eibhir.
Some things are just meant to be recycled. Unless its got sentimental value, or it's a family heirloom, I'd toss it. There's just too many damn fine estate pipes out there to be had for under $50 to try to restore a badly cracked bowl. If you do go ahead, remove all cake down to bare wood. Boil strummel in boiling water for an hour. Replace water several times. Soak overnight in tub of alcohol. Up to a week OK. Change alcohol as it undergoes discoloration. Rub down outside thoroughly with alcohol wipes. Use toothbrush to clean the cracks thoroughly. Clean inside shank with nylon brushes, Qtips and cleaner soaked in alcohol. Dry for a week. Get ypursef three C clamps. Put bits of sponge on clamps. Fill cracks in with superglue. Clamp symmetrically on all sides using three clamps. Till cracks close. Do this before glue as a test, just to make sure cracks seal. If they don't soak in water a couple week, briefly dry cracks and re clamp. Should close now. Then for real apply glue. It's OK if glue oozes out. You'll sand down and re-stain the whole thing later. If this sounds like a lot of work - it is. But worth it of the pipe has MEANING to you or a loved one or a customer. Your call.