I wish I could find them because years ago Terry Weigman engraved a pair of "duckbill" pliers to bend grabs for the Proto 2000 gondola. You bent wire to proper width then used the pliers to get the drop.

Here's a link to one I so equipped:
https://web.archive.org/web/20151002172808/http://home.comcast.net/~jerryglow/modeling/RI_gon.html