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What do you suggest as a solvent to clean the Bijur metering units on my 34 Packard? I have tried soaking them in penetrating oil then lacquer thinner. I then checked for passage of low pressure compressed air. So far so good except for one DC-00 unit. I did notice that the right rear spring used a BD-3 at one location instead of a DC-2. It seems to be OK. Should I replace it?