Rock Machine bikie had been bashed by other members of the gang for removing a club tattoo, Police Commissioner Karl O'Callaghan said yesterday.The assault occurred about 4pm on Sunday in the southern Perth suburb of Hammond Park. There were reports that the man went to hospital with facial injuries but refused to co-operate with police.It is understood the man was recently released from jail. There were reports he was leaving the Rock Machine, but it is not known whether he was leaving of his own free will or if he was being booted out."We understand...