I use Machine Part Welding in penrose they are a bit pricey but have done these sorts of repairs before and do a decent job of it. Machine Part Welding Ltd 09-579 1599 960 Gt South Rd Penrose
oh yea and make up some bullshit story like your racing this weekend and it HAS to be ready by friday so you get priority cause they are usually busy and smaller jobs can sometimes get pushed aside.. hope this helps bro