Here we are again!
First we cut the clear OHP into two pieces and overlay them exactly.
Then, next picture we taped three edges and placed a clamp into it to show the pocket shape.
Next we cut some 3mm brass sheet (see it will etch pretty thick stuff), notice the bent shape from cutting.
Then we flattened the sheet and inside the pocket you can see how filthy the brass is.
Now time for cleaning, we've done half in the pocket so you can see the difference.
Time for major cleaning on both sides.