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How does one determine this orifice size? Photo?

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I have a tiny drill bit set that is #60 (.039") through #80 (.0115"). Some hobby shops have them. Just keep inserting a drill in the orifice hole until you get to a drill big enough that it won't go in anymore. No photo, sorry. I'll try the next time I work on it.

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Did you make this restrictor? Picture?

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I found a 3/16" diameter plastic rod, drilled a .013" hole in the middle, then inserted it in the vacuum line.

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