If you need a clamp of a certain size, it can be made from what is at hand: steel rod, strip, angle or profile. Making them need the bracket, drill holes in it and threaded (or welded nut) under the clamping bolt and the tool is ready.
![](https://modelist-konstruktor.org/wp-content/uploads/2018/06/1-1186.jpg)
If you need a clamp of a certain size, it can be made from what is at hand: steel rod, strip, angle or profile. Making them need the bracket, drill holes in it and threaded (or welded nut) under the clamping bolt and the tool is ready.