Homemade soft face mallet. By Aaron Engineering. 9:55 video:




8:45 video:



Previously:

Caulking mallet and irons - photo
Four-sided hammer - GIF
Glass cutout hammer - GIF
Harbor Freight "Celtic Circle" hammer handle - video
Old hammer+anvil headache treatment - photo
Hand engraving a hammer - GIF
Hammer with collated nail dispenser by michaelyoung4190 - video