Hi Wolf. It's really not that complex.
You order one of those.
1. select the right size plug for the screwdriver
2. switch the selector dial on the mains plug to 6V
3. Attach the plug you selected in step 1 to the end of the cable.
4. plug the mains thing into the mains
5. plug the adapter into the screwdriver.
6. Switch on the mains
Does it charge the screwdriver?
If yes, it's all good.
If no, unplug the screwdriver and switch off at the mains
Then go to step 3 and attach the adaptor the other way around
Repeat steps 4, 5, 6.
Should be all good :)
If that is too difficult, you'll have to tell us the size of the socket on the screwdriver.
Is it a Lidl one? I have one of those and might be able to indentify a suitable, dedicated adaptor