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In depth idiot
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Expat's suggestion is a good enginering practise approach and will solve the problem. What you could also do is:

Take the worm wheel off the shaft and evaluate how freely the table turns under finger power. As assembled mine needed PTFE lube on the carrier wheel axles and plastic compatible grease on the table shaft before it turned really freely, particularly when carrying my heavier locos (500 - 750g).

Take the gearbox off, turn through 90 degrees so that the worm shaft is much closer to the underside of the turntable, reattach gearbox as close as possible to turntable shaft while clearing worm wheel, fit worm wheel to mesh.

That shortens the working lengths of the shafts (less length to flex) hopefully reduces the driving force required (less force flexing the shafts) and may be enough to deliver the required improvement.

The first time I saw one of these kits, the user had attached the gearbox to the underside of the turntable pit. Not only could you hear every meshing tooth, (the pit base acting as an efficient loudspeaker diaphragm) but by attaching a small piece of shiny metal to the pit base and directing a light at it while the motor was running, the turntable pit could be seen to be flexing in time with the audible 'wow-wow' of the drive and perceptibly pulsing table motion.
 
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