The answer to this depending on the rest of your system. I played a modified Precision with the following opening. 1. All strong hands open 1♣. 2. 1♥, 1♠ and 2♣ are standard Precision open. 3. The rest of the limited hands are divided into balanced/semi-balanced and unbalanced hands. Unbalanced hand open 1♦. Balanced/semi-balanced open 1NT. 4. 2♦ is weak two in ♥ or ♠. 2♥, 2♠ and 2NT are all weak two suiter (5-5). 2NT is both minor. 2♠ is ♠ and a minor. 2♥ is ♥ and any other suit. In this system, I find it is very useful to keep 5C4M in 2♣ open because it could make 1♦ open more precise. If you work out possible distributions, you'll find 1♦ open will have either 4+♦ or singleton/void in ♦. The later case must have 4-4 in the majors. Otherwise it would have 5♣ with 4M and should open 2♣. The 1♦ open would have a singleton/void. This is very useful in later bidding and playing. The only exception is 7222 hand with 7♦. In that case opener just keep rebidding ♦. This arrangement moved Precision 2♦ hands into 1♦ and free up 2♦ for multi weak two.