Since I just took a photo of this and sent it to Rob Kelly, I thought I'd post it here as well.
We have a fair bit of hard clay soil in this area, and of course lots of tough roots everywhere. The thin ti of the Big Dig cuts through all that pretty well, but sometimes that same thin ti on the back of the handle wants to make a nasty little cut on the palm of your hand.
Enter Sugru, a moldable silicone putty! It comes in a little packette, and is moldable for a short but reasonable amount of time. Then it sets up and is permanent. It can still be cut or trimmed with a sharp knife, just like regular silicone, even when set.
I made a short string of Sugru, put it on the end of the handle, and flattened it just a bit. Not the most professional job, but it has held up quite well since early summer.
Total weight now it 18 g. Can't remember the original weight, but it's still darn light!