Snibble, I bought a plastic oil filter wrench many years ago and it failed miserabley. I think it may have worked once but it slipped. (type used on the 300se and C280). So I ordered the Mercedes one from Phil at partshop.
It is worth it. It has bolts that can be tighted down incase it needs a firm grip. Noy made of plastic. Has worked 100% for over 2 years.

U got lucky.

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD