I use several different hammers in my Metal Art/Welding Shop. Occasionally a hammer handle has to be replaced. Wooden hammer handles are no longer available in our local building supply or hardware stores.
I found replacement hammer handles for my favorite hammers at Beaver-Tooth. The handles needed only to be slightly sanded to be installed.. The fit was perfect. Wedges were also included with the handles. I highly recommend Beaver-Tooth handles and I will definitely order from them in the future if I need any more handles.