There is some really good info here…good luck on the project, if you have any questions about using the brass ect feel free to ask me.
I will do my best to help ya out.
@Ratbastrd
I could donate some seed shipping pucks for this project.
Or you could buy some here.
I sent my first seeds out in the tubes and they were crushed just like your were.
I learned quickly that the seed shippers are the way to go.
I have more than I need, so hit me up if you need a small bag full.