Wellnut Fastners

[rvdependent]

Discovered that a branch pulled the front of my main awning loose,upon
inspection I found a device or what was left of it called a Wellnut.
Apparently the Stainless steel machine screw goes through the awning
flange and is threaded into this fastener and somehow when it is
thightened holds the awning flange in place. is this the best fastener
for this application? the regular window awnings are all fastened with
stainless screws but this main awning seems to use these Wellnuts for
the entire length of awning flange. Would appreciate suggestions.
Donald Brown 2000 LX-40 Palmetto,Florida