i regularly go to machinery shop to shappen mine.it cost me Rm 10.and it work,but you must make sure that they got the green rotating wheel that special for carbide.let the professional do it for you. Hope this help.
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2006, 30/07 Gunung Lang EP A-main 5th 27/08 MNC Sock A-main 6th,Modify C-main 3rd
2007, Rc planet 11th March,c-main 1st Makro Fun Race 15th April Stock A-main 7,Modify A-main 1st & TQ Ipoh Fun Race 3rd June Stock A-main 3rd(Faster single lap 18.389)