Re: AR-88LF. Tuning box.
There shouldn't be backlash. The design of the large tuning-gears is that they are each made of two separate gears whose mesh with the other gears is controlled by small coil-springs interposed between them so the two large gears are kept in tension.
What can happen though is that over the intervening decades the original lubricant can go hard - this then essentially glues the two gears together and prevents the anti-backlash springs from doing their thing.
The answer is of course to strip out the gearbox, separate the pairs of gears [watch out for flying springs!] and use a suitable solvent to remove all the old congealed grease - then reassemble using a light oil or semi-fluid grease [I use the 'moly-grease' intended for constant velocity joints on front-wheel-drive cars].
It takes time and effort, but you should be rewarded with a velvety-smooth backlash-free tuning drive.
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