Grinder if you find any cheap ones that are good, let me know 
These are made by Prime, and theyre HVAC Seamers, fkn things were like $119, but theyre machine finished and perfectly flat.
Thankfully, I borrowed these.

These are made by Prime, and theyre HVAC Seamers, fkn things were like $119, but theyre machine finished and perfectly flat.
Thankfully, I borrowed these.
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