Spot Welder Pen

Hello,
This is a remix for Battery spot welder pen made by s3rkan (thanks for that), I kept
the idea and a i re-made complete the drawing in order to to fit the components that i have in my garage, the spot welder pen will help me to weld the battery packages with nickel strips.
For the sticks, i used 8mm pipes for air conditioner, i piece of 150 mm is more than enough, the spring has been bought from Bricoman (length 25 mm, diameter 12,5 mm, steel wire 1 mm), the microswitch (20x12 mm more or less) has been recovered from an old iron.
For the tips i used 2 copper nails/screws locked by small M3 headless screw with hexagon socket , concerning plugs i used the standard DKJ 10-25 for welder machine that it very easy to fit.Since this plugs crimped the pipes i added a peace of nail with diameter 4 mm in order to avoid to squeeze too much the pipes, next step is to try it


UPDATE 20210423

Due to power problem (not enough) i modified the drawing means that instead of air cond