a u-joint & 6 inch ratchet extension, or just a 6 inch extension & use care to not strip the bolt. i must admit that thing is tricky.

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped