I read the reviews on here before I bought mine. I got that. This slot is specifically for the plastic oil filter cap, which is tightened to 25 lb-ft (not much). It works exactly for that! If you only need a 36mm jack for general use then that's a downside. Make no mistake, this is a cheap head, but it works on my 1998 BMW 323i oil filter cap when torqued to spec (and I don't use it for anything else). I've used it 3 times now.
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