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.
it's a 3mm allen and you have to go in at a slight angle...I suggest spraying the hole and in the back of the tip with WD40 and letting it sit for an hour or two. then removal should be fairly easy...good luck