Crimping tool?

Ideally, you want a tool that has jaws shaped like this.

They are shaped to roll the crimp and strain-relief then punch them down to 'bite' the wire. This is very difficult to do correctly with normal crimper or needle-nose pliers, etc. (almost impossible with soft copper/brass/silver/gold connectors).

Not the only tool available that will do the job, but one that will crimp correctly...
 

@gdnrbob 

You are welcome, once upon a time I did a lot of DOD work as an engineer, amazing how much can be used in high end audio with great results. You can get this an Homedepot, but there are less expensive uncertified tools of the same design available there.

$450 for a tool to crimp Tin connectors for hifi!? I hope you are crimping a US-Ton of those connectors, but if so - you might just buy an automatic computer-controlled stripping/crimping machine for the same cost...
https://www.aliexpress.us/item/2251832070400401.html?spm=a2g0o.productlist.0.0.120542c1qTViWy&algo_pvid=1c95808e-2ae0-4b57-a907-b42a9abd65ca&algo_exp_id=1c95808e-2ae0-4b57-a907-b42a9abd65ca-15&pdp_ext_f=%7B%22sku_id%22%3A%2210000015546883443%22%7D&pdp_npi=2%40dis%21USD%21630.0%21485.1%21%21%21%21%21%402103255b16710661801846953e7525%2110000015546883443%21sea&curPageLogUid=XCR4JpEJOpjk

@steakster 

I have the same one as @tcotruvo posted. Had it for years.

All the best