I think this subject was covered in detail at some point in the past, ( but I don't know how to find it ?) but both myself & another Y-Block owner are having problems. He has some rockers that won't hold a set & I've got a spare set that many are so tight as to be unusable.. Briefly, 1956 -1.54/1 rockers used two piece  adjusters, is that correct?. (markings?) However, most of the spare rockers I have here, which I believe are from 1957, and are marked  ECG xxxx B 2, came to me with 1 pce adjusters. Even though they were soaked for some days in solvent, then with oiled threads,  most will barely turn, even using a 8-1/2" box end, holding the rockers in a vice!  Can someone clarify these situations?,  For instance, which part is an interferience fit & so on?  Thanks        


Paul