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This is just the bolt that you push on to advance and retract the mechanism.
These parts are threaded, so unscrewing the old one and screwing the new one in tightly is required. We use Knipex smooth jaw pliers to install these so they won't come out very easily.
If you want to send your pen in so we can install a Damascus Bolt for you, please email email@example.com and I can make arrangements.