Once in awhile (not often, about once in 30 units) after cutting a puzzle I get what I call a "pop out".
What it is: I'm using Poplar and sometimes there is a very dark grain running inside. It's almost as if there were a fire during the life of the tree and this is a remnant of it. Anyway, it's not exactly a knot, but after I cut a small piece "pops out" of this blackened area.
Sometimes the "pop out" is in the middle, which I can usually fill with filler or with glue and matching dust.
However, sometimes the "pop out" is on the tip of the unit and I don't know how to fill it when that happens
I've tried filler, glue with dust, putting the piece back in it's cut out to brace it before gluing or filling - I have yet to be able to fix one of these when it happens on the edge of a unit
I use these units now as samples and they're marked so I don't sell them, but I would like to be able to fix them.
Any suggestions other than treating them as firewood?
Thanks as always in advance for reading