More info to all those interested:

After finding a suitable funnel, I gave it a good try with the Flexx boot (part number FB3001) attempting to get the boot over the joint housing... In my opinion, there's no way this procedure will work with the homokinetic joint we have - the housing is just too large.

With some regret due to the cost, but still wanting to continue using the original factory joint/axle assemblies, I ordered the Flexx gun to use to install the four Flexx boots I have. It was 9 degrees in the garage here this morning, and UPS is not delivering in the area today because of the cold and ice on the roads, so maybe soon this phase of the W126 rehab will be completed.

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Respect, protect, and maintain complex systems - whether natural or of German design, to benefit from their full potential.

1982 300SD W126.120 with an OM617.950 from a W116.120
1984 300SD W126.120 with an OM617.951