I'm experimenting with this setup, see pic below. The advantages so far are that you can enlarge the mount by pushing outward with your original metal mount to create any size or curve radius you'd like, or make it smaller or of different shape by pushing in on the mold even as the epoxy sets. Bolts can be preset into the mold before pouring for odd situations where you want an odd bolt arrangement. Not sure of damping abilitys, and my next experiments are to add small tied figure 8's of braided fishing line like spiderwire into the mold to guard against cracking under load. Epoxy weakens and melts regular mono line. Sheet of cut old innertube at the mold curve creates a permanent built in rubber liner after epoxy is poured too. In place of the braided line, squares of screen as sold at Ace hardware can be stacked into the mold before pouring. Of great advantage too is that you can make a deeper mold which creates a taller mounting block so the curve of the block is wrapped around a larger length of your bike's frame insuring more gripping friction against that left lean I've discussed in other posts.