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The "L" shaped chuck key that XTool provides for use with their RA2 Pro rotary isn't ideal. For making large size changes on the rotary's chuck, most will spin the chuck by hand, then tighten with the chuck key.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.