tModLoader - Need help with making a weapon similar to arkhalis.

I want to make a sword have a swinging projectile like Arkhalis, I made the projectile with the help of some older post on this forum. It's swinging, but my problem is, that I have no idea what to change in my code to make the "swing speed" lower (kinda like the "Murasama" from Calamity mod

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