Paul There is the Mercedes coupler i talked to you before ,they have
several models on EBAY and very cheap,you can design the shaft without
spline but only an adapted flange cup to meet the coupler and the flexwheel
as safety in case the rubber fail.I do have an idea of the shaft design with
this Mercedes coupler.Ths one is for the 550 model http://cgi.ebay.com/**
ebaymotors/Mercedes-W116-**450SE-W124-300D-T-300TD-T-**Flex-Disc-Kit-_**

W0QQcmdZViewItemQQitemZ1405639**31332<http://cgi.ebay.com/ebaymotors/Mercedes-W116-450SE-W124-300D-T-300TD-T-Flex-Disc-Kit-_W0QQcmdZViewItemQQitemZ140563931332



http://tinyurl.com/3fhm24k


Jean Prudhomme

Does anyone have dimensions for this type of coupler?  I interested in the
OD and the thickness in particular.

Randy