Sheet metal cutter from engine valves - video

Sheet metal cutter from engine valves. By Jeymous. 7:03 video:

https://www.youtube.com/watch?v=YmTNRD9F6wI


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Question; how do you keep the valves locked in position so they don’t move?
What thickness sheet metal can you cut? It does look nice. Thanks

Pretty large moment arm there, thin sheet metal only...

I only saw aluminum being cut, don't think it would work on much else...