Pinball dolly made out of scrap 2x4 and lawn mower wheels. Slide it in between the front legs until only the handle is showing. Rolls nicely and pivots on a dime.
Not my idea, just my design. I made Clay's LED tester and put it into a pen case. Its very easy to hold and use. It can be used to test PIAs. I also use it to test bulb sockets and output headers on Bally/Stern lamp driver boards.
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