I always used a 1/4 inch drive ratchet,an extension that was about 2and1/2 feet long and a 10mm universal socket. my socket is not magnetic so I would put a spot of something sticky(butyl tape)to hold the screw into the socket as I reinstalled the bolt that secures it to the bellhousing. It does take some contorted movements but you can do most of the job from the exhaust side of the engine.By the way I would make sure that it is a Bosch part. If you do not have the tools,I have seen all of these at Sears.I used Snap-On but unless you do this professionally youre wasting money on the Snap-On truck.