There are lots of brake adjusting tools on the market. I have several, from a Mac to a Harbor Freight to a couple homemade/ bent to work on an oddball. An important tip: film of grease on the contact points on the backing plates where the shoes rest, and also take your adjusters apart, clean and lube the pin/ swivels and make sure the spring washers are in place. You want that thing to turn really free for adjusting up. Also if you can reach in the corner with a small screwdriver/ punch etc. and hold the adjuster bar in off the star wheel to adjust up it makes it easier.
