Big movers on D-Street: What should investors do with Greaves Cotton, BEL and Mishtann Foods?

Sensex and Nifty closed flat on Tuesday. Greaves Cotton surged 18%, reaching a 52-week high, while Mishtann Foods declined 9%. BEL saw a marginal increase. Analysts suggest buying Greaves Cotton on dips, exiting Mishtann Foods, and considering BEL for long-term gains.