Hey folks - I'm a complete bike mechanic newbie working on my daily rider. My rear brake caliper is a side-pull Suntour Cyclone. Recently, the barrel adjuster snapped off, leaving a portion of the shaft stuck in the upper caliber mounting. I've managed to remove the broken barrel adjuster, but now need to replace it to get the brake working again (or so I assume).

Here's the thing. I can't seem to find a barrel adjuster that fits these calipers. The hole that the barrel adjuster would otherwise go through isn't round or threaded. Instead, it has a squared off section on one side. Is it easier to just replace the caliper entirely?

Thanks!