The head is peened over. A short tube or over large head on the other side produces an undersize.
A good process would have a tool that won't allow short pins to be loaded into the press and would measure the force used to peen over each link. Before Demming and load cells you'd employ inspectors to measure so many in each batch to meet British or EU standards.
This is India though. Standards are just rubber stamps you buy and if fate dictates a **** product it'll happen anyway, so just load the machine and ship what comes out!
What RE sell you is just a semi-assembled kit. If you know that they are great fun.
Andy
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