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Over time the rubber turntable belt on my Bowser turntable has developed slack, which makes fine manual movements to line up to tracks difficult.  George Lasley bought off-the-shelf parts from Ace Hardware and built the pictured belt tensioner is about 60 minutes.  

Pretty cool, I thought, and works well.  My turntable now creeps smoothly without jerking when adjusted manually, essential to lining up tracks.

Can anyone please advise me where to buy replacement belts?

Thank you,

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 That's pretty clever. I own both a Millhouse River as well as a Diamond Scale with a Millhouse drive upgrade. This reminds me of my dirt bike days. As suspension travel got longer. All kinds of tensioner were used to keep the chain on the sprockets. 

 Your design after studying the photos is pretty cool. The spring can be swapped out to get just the right tension on the belt. The idlers look like a nut and bolt with a plastic bushing that the belt rides on. A lot of cars have something similar for their timing belts.

 Will. If it's the back side of the belt that is showing wear. An old trick from the dirt bike days was to use a quality skateboard roller as an idler. These feature roller bearings and are very free spinning.

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