For your 129, follow this link for DIY instructions.
http://www.peachparts.com/Wikka/R129TopRelease
Remove both cylinders even if only one is currently leaking, the other won't be far behind....trust me on this. You can buy new replacements from MB or any online parts guys for around $120 each; or you can have them rebuilt by
Dennis Ficken
16285 S. Chester
Olathe, Ks 66062
(913) 544-4521
mercedescylinders@sbcglobal.net
Dennis has rebuilt hundreds of these things, offers a 3 yr warranty, and only charges $30 each + shipping.
Bob
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Bob Jones
Bradenton, FL
'87 560SL For Sale
'99 SL500 For Keeps