England coach Eddie Jones has forced Dylan Hartley to change his tackling technique in a bid to avoid any future suspensions.
Hartley is set to be confirmed as skipper for the Grand Slam defence despite being out of action since December 3 after being charged with striking Sean O'Brien when on club duty for Northampton against Leinster.
The hooker jeopardised his position as England captain after catching O'Brien with a swinging arm from behind and head coach Jones has identified what he views as a flaw in execution.
"It's about better technique. We have spoken to Dylan and he has done numerous skill sessions to pick it up. He is not the only one with that flaw," Jones said.
"If Dylan has his arms in close, then he does not hit a bloke like that. We are consistently reinforcing good technique."
World Rugby's clampdown on dangerous tackles is forcing players to aim lower in defence, but Jones insists that will creates its own risks against France at Twickenham on February 3 due to their off-loading.
"France have improved in the understanding of how they play. I have been really impressed with them," Jones said.
"If France are playing rucks, they're just an average team, but they are picking guys who want to play above the defence.
"People talk about playing through the defence or playing around the defence and France do that, but now they are also starting to play above the defence, picking a lot of tall, big guys who can get above the defence and create off-loads.
"Once they get an off-load they go back to the old France, with the movement, tempo and rhythm off the ball coming in.
"We have not seen that before and that is where they are dangerous, but as opponents you are better off tackling in the right zone with 15 players than you are with 14 players.
"The inevitability is that the game could free up even more and off-loads come in even more. The other side is that people have to improve their tackle technique."