Some of you (hopefully) noticed that I recently got the book VF Modeling Manual. In there, they give a description on how to do a recessed vernier for your 1/72 kit. As I am building an old Imai Gerwalk now, and trying to pep it up a bit, here's what I did to make the vernier.
Start by getting yourself some 5 mm plastic pipe. I'm using Tamiya. No special reason for it being clear, that's just what the hobby shop happened to have in stock.
Next, take the part you want, and drill a 5 mm hole (obviously, on the Hasegawa kits, just remove the original casted vernier area.
Cut a small piece