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OK, so you are saying the packing nut comes loose on both needles allowing the needles to drift, correct? I would use the OEM components, install two packing washers, then position the clear plastic spacer (included with latest OEM kits) in between the fiber packing washers and the packing gland nuts.
Are the threads clean on the packing nuts and in the carb bodies? I guess I would pull out all the packing components/needles, then thread the packing gland nuts in and out the carb bodies to make sure the threads are OK….Make sure the packing nuts are not “bottoming” in the carb bodies before actually crushing/tightening the packing washers. Use three fiber packing washers if necessary….D