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There are charts with suggestions for shade for each welding process and the amperage of the weld. Generally the higher the current used, the darker (higher shade number) the shade you will want. I usually run 10-12 for the MIG welding I do on my variable shade helmet. There may be a shade...

The low pressure switch or AC cycling switch on some systems turns the compressor on/off. They can wear just by the constant cycling on/off especially if the compressor had issues I’ve replaced a couple of bad ones and they are cheap and easy to do when empty. The fill valves are...

I’ve used a gauge set and vacuum pump similiar to what you show hawkrod. My gauge set came from harbor freight and the vacuum pump was from Amazon so likely cheaper in every way but it’s worked for me. I’ve done just a few cars and they have all had no refrigerant in them. After repairs...

If you need a flat bottom hole, you could potentially use a 3/4” diameter 4 flute end mill in your drill press and use it like a drill bit. Be sure to clamp your workpiece as things will want to move. Also use some oil and you may want to adjust your drill press speed.