I've always pulled them out if they were willing,,and most are. They can provide a goo drain out hole many times for the water.
The pressed in variety many times comes out easily with a side cutter type plier.
Grind any bevel off the outside of the clipper so you can close the jaws under the bead and as close to the rib surface as possible. Right on it in fact.
Don't pinch it shut, you don't want to snip the bead off!
Now lever the bead up and out by simply lowering the handle, that lifts the jaws pulling the bead out.
A thin piece of card under the plier pivot point prevents any bruise to the rib matting.
If they are stubborn and refuse first efforts,,I leave them alone. They can be brittle.
Apply the bluing soln right over the bead(s) as you work so you don't miss a spot on the rib itself.
Boiling water tank doesn't hurt it.
Carding wheel won't bother the ivory though the combination of the soln and the carding will darken the ivory somewhat usually.
When you're all done a light polish to the bead with a twist of 0000 steel wool or a tiny bit of Flitz or Simichrome on a patch and you're right back in service.
