I have been soldering a bunch of circuits lately and my hand has been getting fatigued. I thought that a bit of Sugru would help out.
Step 1: RTFM - Cut Open Package...
Get your stuff together and cut open package. Then knead the Sugru.
Step 2: Shape the Sugru and Wait...
I added a bit of Sugru to the 3 main contact points with my hand.
Step 3: Enjoy Soldering Bliss!
Now the iron feels great. I hope that you found this useful!