I had same problem with my new TCI conv.just open up the holes a tad with a die grinder or drill.(i used die grinder,keep as tight as possible.)I have many hours no problems.Actually my converter even came with literature TELLING me I might have to do this.Yours should have too,maybe they forgot to pac it.Don`t worry it is normal you won`t have any grief later,just take your time & only remove material that you have to,good luck.