I did not use the tool for the B3 piston on the other side. I pushed in the piston cover with my hands, removed the circlip, then let it out to rest against the tunnel. It can easily fall out of place! Once again, make sure that the pushrod is still in the hole.
Push the cover evenly back into the transmission being careful to not cut the O-ring on the sharp edges. It may require a helper to put the circlip in place while you hold the cover.
Assemble the parts you removed with a new filter, pan gasket, and crush washers, then add transmission fluid, following the procedures in the manual. If all goes well, you won't have any more piston cover leaks.
Part numbers for piston cover O-rings:
B1: 000 997 47 48 64
B2: 000 997 48 48
B3: 008 997 35 45
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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles