サーキットビルダー用スプリングワイヤー

Lost one of these tiny springs under the couch and my kid's circuit project was dead in the water, so I grabbed a spare. It clicks in just as tight as the original piece and the connection holds fine.

This single spring wire slots right into my circuit board and makes a solid connection every time. Exactly what I needed to finish the project without hunting for extras.

The spring coils hold their shape way better than the stiff wires that came with our kit, so my son's circuits actually stay connected now. It snaps right into the single-piece slot on the board, no fiddling required.