Shock pistons proud

[jaffacake]

Hi guys, trying to build my 410 shocks,i screw the shock eyelets onto the bottom of the shock shafts as far as they will go just before the shaft is making the pivot ball bind, but on pushing the shaft back into the shock bodies the piston is sticking out 3-4 mm proud!! this obviously cant be right
Or is this normal? & you set the piston 3/4 of the way up the shock body when bleeding the shocks?