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can't find the right size heat sink and fan for my motor

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kadenw968

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recently bought a hobbywing ezrun combo a2 as an upgrade for my rc car https://a.co/d/6Jc49uw , and the 18T/2030 motor gets really hot so i want to buy a heat. sink and fan, but i can't find one on amazon thats the right size, does anyone know where i can get one thats the right size? the motor has a 20mm diameter.
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i bought a heat sink & fan https://a.co/d/bnCZri5 before being able to measure the motor, and the opening for the motor on the heat sink is 26mm so it’s way too big for it
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trim down heat sink. try a hose clamp for a radiator hose. a smaller pinion.
 
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