Why does it have to be so long? I use the appropriate wrench from a set of these wrenches I bought for about $25 at AutoZone (they didn't have them as single items - I believe it was a pack of 4 or 5) to take the head bolts out of a 190E 2.3-16. Now, I damaged a bolt (one up against the firewall) by not getting the wrench in there square and having the wrench pop out before the bolt broke loose. I put the wrench into the hole, then tapped it in with a few light pops of a hammer, and then, once it was really seated in the bottom of the socket, I was careful to make sure the torque was applied "square" to the fastener. Came right out.

If you don't buy the wrench though, don't try to get the fastener out. They are in there pretty good and you don't want to mung the fastener up so it can't be removed the "normal" way. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)