410D coupling flange torque setting

Hi all, I'm looking for help with my 410D van (Mercedes Light Transporter). I have to replace the diff -> prop shaft coupling flange. I'm told the
torque setting for the retaining nut is critical, but nobody seems to know what the actual setting is. So I'm hoping some kind person here might be able to please help me out with this bit of information.
Or, failing that, suggest from experience how they've dealt with a torque-less coupling flange situation.
Many thanks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.