Remington Model 8 Barrel shroud tool

[stiktx]

I'm going to try to build a wrench to help a buddy disassemble his Remington Model 8. I've seen a couple different designs via an image search, but I was wondering if any of you guys had any thoughts? It looks like it can be as simple as a wide blade to engage both sides of the bushing, or complicated with a barrel nut retainer screw coming into the tool at 90*. I'm sure a ton of guys have made tools to get these old guns apart. Thanks