fionashanahan, If really stuck, give a touch of penetrate oil down the jaws of the chuck, put the drill in reverse, firmly grip the chuck with gloved hand and gently squeeze the trigger up the point that you cannot hold on. If it still doesn't budge and you're not able to hold the chuck against - Ryobi P202
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Power Drill Repair - iFixit
Ryobi P271 Drill Bit Holder Replacement - iFixit Repair Guide
Power Drill Repair - iFixit
SOLVED: release the chuck with stuck drill bit - Ryobi P202 - iFixit
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I found EASIEST WAY to REMOVE STUCK BIT in keyless chuck to NOT DAMAGE chuck
Ryobi A10KC31 1/2 in. - 20 Teeth per in. Drill Chuck and Key