I'v read the arcived posts on the restrictor valve and I see that some have removed it with no bad consequences. Is it possible for that restrictor to get so gummed up after 60 years that it could cause a front caliper to seize? Reason I ask is I had the left front wheel lock up on me a couple years ago and I don't think it was a too tight or loose spindle nut. Is it possible that a partially blocked restrictor would seize a caliper under cerain conditions ie hard driving?