From Robert Murray-Smith.

You will find the STL files for this here https://www.thingiverse.com/thing:6822399

the STL files for the piston can be found here https://www.thingiverse.com/thing:6819005

and the video for the poiston is linked at the end of this video

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Don’t forget to check out my companion channels TnT Omnibus here https://www.youtube.com/channel/UC1E8OmOG17VckoPviOPmkMw and TnT Talk Time found here https://www.youtube.com/channel/UCVaUhDJTviZ17K8vXnR1HjQ