34 Pickup Rear Brakes

[jhswolf]

One of my winter projects is to do a rear brake job on my '34 Pickup with mechanical brakes. I need a couple of pointers.

The right rear adjuster wedge screw was frozen with rust which temporarily prevented my from loosening the brake shoes and removing the drum. I was able to heat the screw housing enough and get it to turn which relaxed the brake shoes and I pulled the drum.

Unfortunately, while the adjuster turned, it snapped off inside the housing (I don't know what the housing is called, but it seems to function like a wheel cylinder) (see blue pointer).

It looks like new adjuster screws are available, but how can I get the old adjuster out? I'd rather not drill the rivets that hold on the wheel cylinder. Is there a way to pop off the adjuster grease cap (see yellow arrow)? If I got the grease cap off, would I be able to access the end of the adjuster enough to get some vice grips on it and turn it out?

If I have to get another wheel cylinder, any recommendations on where I can get one? I'll have to get two sets of rear brake shoes, adjusters, and grease caps.

Thanks!
John