How do you practice to keep your left hand straight throughout the swing?

Question

It is true that at impact your right arm is still slightly bend and after hitting the ball then it become straight?

Answer 1

a few yrears ago

my father gave me a "medicus" training club

it is hinged near the foot

if you take away to quickly

or at the wrong angle it will break

if you come down to quickly

or with your wrist turn improperly

again, the hinge will break

but if you swing accurately

you can smack 'em like a five iron

Answer 2

if you were your watch left hand place a pen under watch band, top of erist fust swing the club waist high to waist high . left arm only . works chap . great chipping , putting drill also