Hi TB

For what it is worth here is my solution.

Through my career when my adze handle came loose, because of the taper inside the head (or the rectangular socket) it was just a matter of taking a mallet and tapping it in further.

If the handle was created properly there should be enough of the handle protruding to remedy the situation. For a short term fix if there is alot of play use a piece of thin leather and then tap in the handle snugly just to finish out the day, this is not a long term fix!.

What ever you do don't work with a loose handle, because it can cause a serious accident, stop and tighten or make a new handle what ever the case may be.

NH