Positioning your arms on the putter correctly will allow you to arc your putting stroke correctly so follow these simple steps to get your arms working for you when you putt
One of the most common faults in the swing is taking the club back outside, to fix this many players try to control the clubhead but in the swing it is actually the club handle that controls the clubhead so put a tee in your grip and measure your handle distance from your body through the swing
Open your clubface, aim left and swing outside in