Even though I'm not a fan of Metallica, it sure is a cool pinball machine. It is very mod friendly and therefore it's easy to add some pretty cool accessories. We purchased the Premium version of Metallica in 2013, hooked it up with a sub-woofer, and our arcade has never been the same. Our first mod for this machine was the snake fangs, made possible by the early breakage of the OEM version. Metallica removed the fangs from the machines after discovering the issue leaving wide open the opportunity for Mezel Mods to work its magic.
We created the fangs using our shops 3D printer. After many batches of fangs and a TON of experimentation, we found a design that eliminated breakage (so far) and could be made at a reasonable cost. Snake fangs are one of our biggest sellers primarily because they fill a gap in Stern's original design. They had intended fangs but didn't have the right design.
But what really puts the finishing touch on this former turtle of a snake is this sticker for inside the mouth. It's made of high quality materials making it sturdy and likely to sustain thousands of games. Available from Joe Raptor, this is one incredible deal of a mod at 2 for $10. It's hard to imagine this snake without his tongue!
Another personal favorites are our speakers 
(shown in this video with yellow LED). The speakers in yellow flash with game play. Combine the two speakers with the 2-wire Sparky Electrocution helmet and you get a really cool effect! Check them both out in this video. The yellow LEDs look realistic, like what you might see when looking on stage at Metallica performing.
And on the essential mod list not for aesthetic appeal, are Cliffy Protectors. With the vibrant color and play field artwork in the Metallica machine, the last thing you want is it ball damage. That pesky but essential silver guy will damage your play field wood and parts. Enter Cliffy protectors that ensure your play field is protected from ball drop to may other locations.
Cliffy is well regarded in the industry as the 'go to guy' for protectors of these sorts. People refer to them by brand. "Have you bought your Cliffy's yet?" Available in many online shops, sePeo
What is your favorite Metallica mod? What mod do you wish was available?e Cliffy's site for more information on his Metallica protectors.