In reply to SteveN1:
Hi, Many via ferrata lanyards have a third shorter sling to use for resting,
so you use the two longer ones for moving on the via ferrata and if you get tired you can attach the third to a rung and rest on it.
check out this page from petzl to see what i mean - https://www.petzl.com/DK/en/Sport/Installing-the-via-ferrata-lanyard-on-the...
look at the section called "Remember to install a connector on the resting point" and you will see what i mean, this short sling is just for resting and you unclip it when moving. some times if a lanyard dosen't have this extra attachment people can use a sling. not sure if this is what they mean?
If you can take a photo, of your set up happy to advise. if you can post it here you can email me
rob@ecrinscollective.com
cheers Rob