mallets, mauls and weights for stamping tough leather

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I  have looked at very expensive mallet maul designs.  I  have read a few comments about indentations developing fast in the plastic striking surfaces of some mallets and mauls. Are replacement maul striking surfaces sold or is it simply cash in the trash after the striking surface is messed up? Obviously garland and wiha split head mallets available that use disposable hammer faces. In your opinion which plastic hammer face will last longest before failing? http://www.garlandmfg.com/mallets/faces.html  https://www.wihatools.com/shop-tools/mallets/replacement-hammer-faces  I'm trying to practice stamping some moistened dark brown .088"  to .100" thick looks like pre dyed leather the scrap stuff sold in craft store grab bags. I'm using a thick granite surface plate from woodcraft and moistened the leather with water and sponge and let return to its previous color.