I disassembled and greased these pedals yesterday, and there is no cap to remove nor any means of adjustment; everything is simply riveted together. I ground off the rivet heads, cleaned the pedal blocks with soap and a brush, dipped the rest in carburetor cleaner, and rinsed it with water before greasing the bearings with marine grease. Then, I used five-inch long 10-24 screws and nylock nuts from Fastenal to reassemble everything; I don't like the size of the nuts, but I wanted to ensure that nothing would come apart. Thinner nuts would look better, and you could probably use Loctite or something to hold it together. I did have to cut the bolts to length once everything was assembled. Unfortunately, since there is effectively no adjustment on the bearings, they are still a little loose. I thought I'd leave this here in case anyone ever has a reason to take a similar pedal apart.
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