That is a stress area, Later cases had bigger strengthening ribs ..........
Had the same problem with the aussie club racer, scroll down about a 1/3rd of the page to see the different strength of the webbing
http://www.xs650.org.au/Club Racer Stuff/Club Racer 2017.htm
Had the same problem with the aussie club racer, scroll down about a 1/3rd of the page to see the different strength of the webbing
http://www.xs650.org.au/Club Racer Stuff/Club Racer 2017.htm