Does the Goodtime Banjo Armrest Come With A T Wrench?

No, the Deering Goodtime Banjo Armrest does not come with a t-wrench. You can purchase a t-wrench for the Goodtime banjo here:

https://www.deeringbanjos.com/products/banjo-head-t-wrench

You will need a 9/32" t-wrench for your Deering Goodtime banjo.