Call Profax/Lenco, they are still in business

 

I have an old Lenco A-3000 Panelspotter:

The cables are 3-1/2 ft long and 4/0 gauge. Mine was missing the ground clamp, but came with the stinger. I changed the connector for the control cord and had to replace the shaft on the timer pot and find a replacement knob. It's still a work-in-progress.

 

Those units did not use a 'ground clamp' they used another end exactly like the one you have in the picture- sans the switch. You hold both 'guns' (for lack of a better term) firmly against the panel- press the button and the result was two spot welds. You would move down the panel like this to produce a series of spot welds. The newer style Lencos use a pneumatic clamp assembly to hold the panels tight together for a good weld -that was the issue with those units- guys would not press in hard enough to get good contact with the underlying panel and thus produce a crappy weld. The 'gun end' or stinger if you prefer should still be available from Lenco as are the new clamp type-but they are pricey and the new units run at much higher amps(>6000) for better welds. If you take the time to learn how to use it correctly they are a nice body tool to have and are coming back in 'style' again with the advent of the new clamp assembly gun. Make sure you have nice clean metal on both sides of the outer panel and where the weld will be on the inner panel.

 

Thanks for that info and correcting me! It's much more than I could find looking on my own.

 

Spot welders are resistance welders. Think of shorting a battery and the point of contact of the short gets really hot and melts the ends together. That's what a spot welder does.

 

Glad to help- Southpaw is correct that these are resistance welders just like shorting out a battery. Here is a link to the catalog on Page 3 you'll see a pic of the Mark II and it shows what your's would look like with the correct setup. One tip is to make sure you keep the work tips dressed to the right size over time they 'widen' and the welds suffer as a result this was the other 'mistake' many made years ago. I see they now offer a new cable assembly for doing basically pinch welds. You might give them a call and ask what new accessories will work with yours or if there are any upgrades. If you plan on using it alot- get some extra tips. At one time many guys dreamed of owning one of these as they were pricey in their day.

http://www.lencoautomotive.com/uploads/7/4/5/6/7456724/automotive_2012_catalog-no_cover.pdf

 

I have 2x of these.
One of them, I bought the “Conversion kit” that allows you to use the newer accessories.
I have one set up with the original style twin guns, and the converted unit with a dent puller accessory.
One was in nice enough shape, the other was rough, so I restored it, mixing custom to paint to match OEM, fixed the wheels, etc.
Both are great, and in use.
I recently bought a Mk2 as well.