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That make sense for coil shorting/ disable spark. So the Prim(green) is used for both measuring primary voltage and grounding coil. Input and output on the same wire:headscrat The user manual is a big binder book. I can never find a pdf version on the internet. It would be much better if...

Does anyone have the Interro PDA/ OTC Vision/ Matco Insight user manual? I want to know how the secondary probe setup. It has red alligator clip, which is not the ground wire. It seems there is a way to short the conventional ignition coil for cylinder drop test or cranking test. For crank amp...

I have the 3102 version, just a bit more powerful. I only use in tight area for cutting. It works but puts too much stress on the tool. The angle head locking nut is stripped and the gear makes more noise now. If you work in more open area, just use 4.5" angle grinder.

You are lucky as not all shop open to public for Friends & Family Shopping Night. My location is for employee and stuff's friend and family only.

drill doctor is not easy to use. different size drill bit require slightly different setting. I having difficulty to do the final drill angle splitting as the default setting always mess up and I will have to grind the drill bit one more time. Later I find out it is easier to split the angle...

A tram gauge will give you most information you need. If you deal full frame trucks you may need center gauge as well. Unless you have an alignment machine, you can't tell exactly which suspension part is damaged other than the obvious.

Nothing is really wrong with it. I tested a few ratchets in my shop and they all behave the same as you, but they all work fine when tightening and losening nuts. When your hand hold the socket, the air ratchet just acts as a spining off a nut, usually not very high torque and the ratchet will...