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This is interesting and wouldn’t mind trying it but have some questions.
1) requires an 11mm diameter spring but how LONG is it supposed to be?? (Length of spring at rest)
2) should this be an Expansion spring or a Compression spring??
3) do you have assembly instructions for the Co2 launcher/trigger ?
4) How long should the scribe be ? What diameter?
Very cool project but the above questions are keeping me from pursuing it.