Quoted from GRUMPY:

Add shims/washers under the lower play field where the locking screws hold it down. The screws will hold the washers in place to keep them from falling out. You get the best play on both

Quoted from frenchmarky:

Mine is at 5.7, plenty fast for me on both playfields. I could probably live with 6. Yes shimming up the lower would compensate if you're accustomed to 6.5 or 7 on your games.
Is your track switch #53 clean and adjusted correctly? Is the gate release coil pulling in okay but the ball is still not clearing it, or (?) Or does the ball just sit there on the switch and nothing happens? I suppose if your lower playfield slant was WAY too low after really cranking up the upper pf, it could mess with the ball being released by the gate cleanly, or cause the ball to barely get hung up by the switch sometimes.

Quoted from Matt08:

You can get it there
https://www.flipprojets.fr/Home_EN.php
I have got it last month.
Works perfectly, real update to 80A system.
Not really cheap, but it's worth.
You also inside get ball save, and lane change
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Quoted from sparky672:

This System 80 Sound & Speech board might be readily available, but the Votrax SC-01 speech chip is hard to find and typically sells for several hundred dollars on eBay. The LM379S amplifier chip is also becoming rare. There's been talk by one or two pinball sellers about a clone of the SC-01, but so far nothing has been produced.
The Sound & Speech board is a B-20887-x, where x denotes 1, 2, or 3. They are all the same board but with minor revisions. In other words, you could get a rev 1 board and make the simple modifications to bring it up to revision 3.
Also check out Pinwiki for this type of information: https://www.pinwiki.com/wiki/index.php/Gottlieb_System_80

Quoted from DaveTheTrain:

I'm someone who thinks GI should never be coloured (except in extreme circumstances and then not all of it) so take this with a pinch of salt.
I think blue GI Is a bad idea.
For one you'll wash out all the artwork on the plastics and loose the detail.
Secondly, blue is not good for illuminating, especially on a big open game like BH that already suffers with being dark.
I often play a Demolition man that has blue GI and it's awful, you can't see the ball and it hurts your eyes.
What I'd reccomend is cool white frosted comets. They're closer to blue in the white temperature, so they will work really well on Black Hole with the blue artwork, adding to it not washing it out .

Quoted from DaveTheTrain:

Ice blue works in the backbox! Are they clear or frosted?
I wasn't sure what would look best with the infinity lights, I thought clear might be?

Quoted from Crimcyan:

Just replace the rubbers on my black hole now this issue came up.
When in the lower playfield sometimes it would act like I drained the ball in the lower playfield when I didn't. So mid game the flippers would cut off, lower GI goes out and the game says re-enterance success/failed and would force me to to drain.
Any idea what this could be?

Quoted from sparky672:

Generic? It's just a metal box. There's a cover with three holes, but maybe you don't care about the cover? What exactly are you trying to do? Are you putting machine into service and want to keep the coins locked away from your service staff? Or are you just wanting something for your own use?
I never saw any reproductions or generics. I found my original on eBay several years ago. Try calling Steve at Pinball Resource.
If you don't care about finding an original and don't need the lid, then why not just use any kind of box or container? If you are looking for something with a better fit and a locking lid, anyone you know with some basic tin working tools and a sheet-metal brake could make one.