My method only reduces the magazine capacity by 2 or 3 rounds. It may not be necessary to shorten the magazine spring at all; on the other hand, one can easily shorten it if there is a tendency for the shells to pop out the top. In any event, I should think that removing one bend would be sufficient.

Maybe we should have an association or society devoted to users of (Norwegian, German, Swiss) Milling Machines. A skilled practitioner can truly work wonders with a file, if one has the patience.

Using a 1/4" plate for a filler will work fine. I thought about doing that myself, but decided that it was too much work and that the other method suited me better.