0.5M 20/30/40/50/60 Teeth Copper Worm Shaft Gear Combination 1:20 1:30 1:40 1:50 1:60 DIY

0.5M 20/30/40/50/60 Teeth Copper Worm Shaft Gear Combination 1:20 1:30 1:40 1:50 1:60 DIY

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