Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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I'm sure there is a special tool that will remove the retainer ring, but I don't know what it is or where to get one. Really though - there's no harm in drilling a small hole to facilitate removal. Or cutting a slot.
If you do drill, I also recommend you find a 1" length of brass or aluminum tubing, cut it lengthwise, and slip it around the piston rod while you're drilling. This is to protect the rod... in case you do slip you won't nick the rod.