Bingowings said:

I wonder what Dr Freud would make of that suggestion?

Good call though especially seeing as he lost his Father's good 'weapon' in their previous encounter.

Luke chucking it away in disgust would also have added potency.

Didn't catch it. What'd Freud say?

And yes, it'd add potency when he looks mech hand (and here ot could somehow be added a shot of his other hand looking the red sabre) and then turns it off.

Being even more radical, Vader could find Anakin's sabre at the end of ESB.