Yes Seahorse I used mild steel so I could arc weld it to the original peg for maximum strength . I used little pieces of six mm rod to bridge the gap between the old and new serrated strip . I could then weld across both joins.
They ended up 50 mm wide which is far more comfortable when standing up.
Thanks for fixing up my photos , and for the advice so I can do it myself, I'm using an iPad if that makes any difference .