So I had to do some tinkering again.
The handle was not so difficult to make. A bit of brass wire of the right diametre bent into the right form. That was it. To glue it to the barrel proved a lot more tricky. But with the help of a bit of modeller's putty this problem could be solved. I mixed a tiny ammount of two-component-glue, dipped the ends of the handle into it, and put the thing into its position.
|(In this case this was done after painting the thing.)|
I am quite content with the result. Of course it would have been easier if the modeller had not forgotten the two items on the barrel!