that's one way to try to hold a tobin together during recoil??....
A little clarification. A Tobin doesn't need to be "held together" during recoil when it is used with low pressure ammunition. I expect they would be just fine, for long use, if loaded that way. Further, a Tobin is far from the only older design that it is common today to consider the use of lower pressure ammunition in, in order to keep it healthy, for a longer period of time.
I have seen a lot of old doubles, Tobin, and otherwise, that had simply been brutalized in use. Not always a testament to the shortcomings of the owner, or the gun, either. And unspeakable repairs applied to said guns. If you lived, for example, in the Klondike, 80 years ago, and needed your gun to work a few more times, that may have been your only option, besides going without the gun.
Something like that is my guess, here. Just a quick repair to get a tool working again.
Best,
Ted