Quoted from JB-7X:

I've lurked around this site for a long time but never bothered making an account because I had nothing to talk about. Those days are over now, its time to join the club! Just got my first pin yesterday. Picked up a HUO Metallica Monsters Premium from Kurt at hemispheres amusements. I've played plenty of pros out on location but never a premium. For the price I couldn't pass it up. Ordered some leg protectors, a pin gulp, some super bands , and a full set of plastic protectors from pinbits. Really looking forward to diving into this game over the weekend without my job getting in the way!

Quoted from j_m_:

thanks to everyone that replied on the wire ball guides
my next problem is with the snake kick out on my premium, but I believe that I've finally figured out this issue
for those of you that have had to completely dismantle the snake assembly to insert the teeth from mezelmods.com, and are now experiencing ejected balls that seemingly kick out where ever they damn well want to instead of to the left flipper, this is what I've found:
not only is it a rather complicated assembly, it's a pain in the @ss to re-assemble and position the parts correctly. incorrectly assembling it is the cause of the balls being ejected in a somewhat random fashion because the plunger assy [part no. 515-7309-00] is not striking the ball dead-center when the coil is fired

the 2 longer metal screws that join and line up the 2 assemblies together (as indicated with the green highlighted areas). those plates need to line-up *perfectly* before you tighten all six screws; the 2 metal screws joining the assemblies as well as the 4 wood screws that mount both assemblies to the playfield (indicated by the purple areas)
if the 2 assemblies are not lined up correctly, the nylon end of the plunger assembly will not strike the center of the ball as it sits in the snake's mouth, resting in the small, circular cut-out of the snake upper jaw weldment [part no. 515-9669-00] (as shown highlighted in blue in the above [inset] image)
it's ashamed that stern did not create these parts to automatically line up when they are assembled (either in the form of "ears" on the snake upper jaw weldment or the snake coil bracket assy [part no. 515-9671-00] or some sort of stiff gasket to line them up, because it's very difficult to see where the top of the plunger assembly is sitting in relationship to that circular cut-off of the weldment where the ball rests
I'm going to purchase an endoscope from amazon.com (like one in the link below) that has a 45° mirror to correctly align the assemblies and hopefully correct my issue
amazon.com link »
edit:
since the endoscope allows you to take photos and video, I'll try and take some of both and post here once I receive it on thursday (2017.jan.05)

Quoted from WJxxxx:

If the adjustment doesn't work. Rather than buy a new one, swap switches 1 & 4. The extra weight of the balls will most likely cause the stiff switch (previously switch 4 now switch 1) to register