I’ve found a couple items that I think will work for making grab handles and wire rails for models. I apologize for the poor quality pictures, but hopefully they are clear enough to allow you to see what I'm trying to explain.
Printed Circuit Board
I found the first one at Radio Shack for about $3. The Shack had other sizes and even some round boards, but this one has holes spaced the closest together.
The Circuit Board is approximately 1-13/16” x 2-27/32” and is about 1/16” thick. It has 417 through holes that are 0.020” diameter, and evenly spaced apart at 0.100” vertically and horizontally.
I sanded/filed one of the long side edges until the edge runs through the center of the outside set of holes. Note – sand/file towards the face of the board with the copper printing, otherwise they probably will be pulled away from the board. The sanded edge created “notches” that should make it easier to make the second bend in the wire.
I’ll measure which hole to a “notch” is close enough to the size I need. The appropriate hole and notch may be horizontal on the same row, or may be diagonally on different rows. Also, the hole and the notch could be marked with a colored marker.
For bending a grab handle, I insert one end of the wire into a hole and hold the end with a pair of pliers flat against the underside. This is more secure than trying to do so with just my fingers.
Next I bent the wire across the board, pulling it tight to make the first 90 degree bend.
I bent the wire into an edge notch to make the second 90 degree bend, pulling it tight to make a tight bend.
I removed the bent wire…
… and snip off the excess ends to make the grab handle.
Mesh Erasing Shield
The second item I found in the drafting supplies in Hobby Lobby. I’ve been using Stainless Steel Erasing Shields for drafting and drawing since the late seventies, but they are all of a standard pattern that I’ve used also as scribing templates for models. This is the first one I’ve found that’s different.
The shield is 2.36” x 2.705” and 0.007” thick. The mesh holes are approximately 0.0225” diameter (or a #74 dill bit), and they are appear to be 0,030” apart but in a hexagon pattern. And there’s a kah-zillion of them, so I didn’t bother counting them all.
Since the shield is so thin, I think it’s best for thin wire.
I inserted both ends of a length of thin wire in two holes that are spaced apart the distance I need.
Next, I pulled BOTH ends of the wire tight to form the 90 degree bends of the grab handle.
I removed the formed wire…
… and snip the excess ends to make the grab handle.
To help with making multiples of the same size grab handle, you could also use a piece of masking tape over the grid of holes and only punch the holes through you need to make that size. Once you've made all of the copies you need of that size, replace the tape and punch holes for the next size.
Yes, you can make grab handles with just a pair of needle point pliers, but hopefully these two items will give you options for other sizes/lengths.