Hello Amanda and welcome to the forum.

It would be a very good idea for you to purchase a lens wrench to attach your Copal 3 Shutter and Nikkor lens to a proper lens board. There are other ways of doing it but a lens wrench is the safest and best way. They are inexpensive too! Here is a good one.

https://www.bhphotovideo.com/c/produ...ns_Wrench.html