Do 23 and 45 Grafmatics use the same handle ?
I mean same part, same size.

I only have 4x5. One has a broken handle the others I have made replacements using the pieces of the broken ones as templates. I can measure the broken one with a caliper if that will help. The base is fully intact.

Thanks Charles, but this will not help.
I own a 45 for spares but no 23 and the one currently offered is a broken 23.

I have one 23, across the widest part where it attaches to the darkslide it is about 45.7 mm, 3 rivets about 37 mm center to center on the outer ones with the third in the middle and around 33 mm from the bottom of the base to the top of the grip.
Maybe you can compare this to the 45 parts you have on hand

Done.
Same part.
Thanks Brian.