how can i get the adjuster to go down so as i can take my drum off i have a wheel cylinder that is leaking so im replacing both sides and the shoes since im going to have it all off anyways. i have as my name hints a 1980 c-30 it has the jb-8 brake system which is the bigger set with 3-1/2 inch brake shoes. if anyone can help please let me know as it would help alot