HELP! om603 IP stop lever shaft fell into pump

[Oldtimer]

Hello everyone

yesterday I was working around my w124 300D non turbo engine, changed automatic transmission hoses, fixing power steering pump problems etc. Also removed some bolts and small parts for zinc replating, removed air filter housing too and found leak on injection pump stop lever shaft. Then remembered that some time ago I read this PeachPartsWiki: Injection Pump Stop Lever Oil Leak Fix so decided to fix this. Losened lever nut, removed ring clip, washer... and made very silly mistake. Somehow looked that I also need to remove nut that goes around the shaft, so I turned it off, and bad thing happens - stop lever shaft fell down in IP
What options I have? Remove all rear part of pump? Or maybe stop vacuum element? How this shaft is connected to internals? Any information would help... Thanks