Ya know what you mean, I also have some cheap foreign stainless steel threaded pin shackles that donâ€™t have eyes, but I donâ€™t use them. There are some special use (temporary connection) shackles without eyes like the captive halyard shackle but I never read a manufactures spec sheet that used pliers on them.
By using pliers you are weakening the design structural strength of the shackle (reducing its capacity) which in most cases is probably mute due to application. Stainless steel is easy to strip the threads of when over torque. Steel one once rusted are too hard to remove.
You can use keypin locking shackles if you donâ€™t wish to use threaded pin shackles. They require no extra securing.
Apalach Iâ€™m not telling you how to use your shackles I am trying to give an informed view to those who wish to use them properly so they donâ€™t lose what the shackle is hooked to.