If you send it to Montblanc and for their level 1 service they replace your cracked cap and cracked barrel with new ones do you consider that 'kills the pen' as far as you're concerned? It's your pen and your decision. It doesn't matter at what stage others think it's dead.
I personally think it's already dead since it has a cracked cap and barrel, won't write without leaking, and won't keep ink inside it without drying out or making a mess inside the cap, or indeed maybe onto any surface that it comes into contact with.
Your chances of finding the correct barrel and/or cap on eBay are remote.
So you either have a dead 146 now or you can get it brought back to life for a reasonable price.
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