float

hi, can anybody tell me how much movement there should be between the outer disc and the inner part as mine has a lot of play now i have cleaned the disc buttons, is there a max amount of movement before they are classed as worn out ? plus is there a special tool to thighten up the headstock.

Any max tolerance oan the amount of float on front brake discs on the carrier bobbins? ah ken theres aye a fair bit o side play but whit aboot axially?