Hi Von, I thought this was part of checking heat treat.Best thing is to learn your HT process better so there is no need to do that before the knife is finished.
The tang is too short - I should have clarified that. Burning it in seems the simplest and strongest way I think.I'm guessing it's a thru tang since you mention burning it thru. Just for testing you might wrap a few layers of tape (electrical or duck) around the tang just for testing. I surely wouldn't do much in the way of a temp handle that's just for testing.
Good thoughts, ChrisFor instance, a rigid handle acts like a splint on a broken bone with the tang being the bone. If the tang is more rigid stress points shift to the front of the handle area near the ricasso. If the handle is somewhat flexible, like a taped handle the tang MAY share some of the load and hide a weak area of your design and process.