You know there is a tool to adjust contacts in EMs
it still blows my mind that some people still use needle nose pliers

Look here and drool:

http://andysarcade.com/personal/org/testrigs.htm

I did build something for working on my pins, and it was helpful. It is a simple lift that I salvaged all the wood for. The pallets that my pins were shipped on was all the wood and I bought wheels, hinges, and small bottle jack and a cheap outdoor doormat for the pad . I later bought some skates that I use more, but I still use my lift. I will take a few pics and post them if someone wants to copy ......I didn't say it was beautiful, but it works.

robin haha great page

I have a custom coat hanger tool to get under the Heart ramp to tighten the long nuts.

http://www.flipjuke.fr/banc-de-test-pour-cartes-driver-gottlieb-system-1-et-pi-1-x4-t11369.html

This is the test pcb that Pascal Janin designed. He is also the designer of the system 1 P1 replacement CPU and the P4 all in one. Also He has replacement sound PCBs for system 1 and 80 and I think He is doing a System 80 CPU as well.

His stuff is top notch and rock solid!

Use a piece of small diameter fuel or vacuum line to grip light bulbs in hard to reach places. .12 cents a foot. I'm a cheep date

Not a secret tool but a head-mounted flashlight or torch for you Brits. Frees up the hands.

I found a tool at Sears to be useful
one end has a small mirror and the other a magnet .
great if you drop a nut or screw under the PF plastics.

For all the old farts like me, I use a headband mounted magnifying glasses with a loop for the right eye. Really helps when I am soldering small connections under a playfield.

I also use a swing arm magnifying lamp for PCB bench work.

It sucks as you grow older and your eyesight is not what it used to be.

Also made a PCB holder out of those spring clamps available at HD , Lowes, etc.Use different sizes, ie 3", 4" 6", mounted to a scrap piece of wood. Bottom of the wood is no slip rubber backing. I clamp the PCB to the clamps and it stays steady in place.

As I use to do a lot of TV work back in the day and still do Stereo Receivers, amps, guitar amps and synths I built a box years ago with a Variac, Voltmeter, Ammeter, On/Off switch CB and a regular two postion outlet built into the box.
As I crank up the Variac I can monitor voltage and current draw. Very useful for gear that is blowing fuses upon turn on.