Topic: Inner fender punch

[RoyceP]

The hand nibbler requires a 3/8" diameter hole be drilled to start with. From there it's maybe 15 bites per nutplate square hole in an inner fender apron.

[RoyceP]

Several more hand versions on eBay too. Here's an example exactly like mine:
https://www.ebay.com/itm/224588139216?hash=item344a7f0ad0:g:3xUAAOSwDGFhKUXw

[jwc66k]

Several more hand versions on eBay too. Here's an example exactly like mine:
https://www.ebay.com/itm/224588139216?hash=item344a7f0ad0:g:3xUAAOSwDGFhKUXw

If carefully used, it will work fine. Drill out the center of the rectangle you need, and "trim" the rest - again, carefully.
Jim

[Bossbill]

OK, drill 4 holes with the correct corner radius, jig saw inboard of final fit and use a small belt sander or file to smooth things out between the holes.

These mini sanders are very useful.