The Bruins, Islanders and Penguins search for that elusive third banana.

Throughout the NHL there are a number of lineup spots that are very appealing from a fantasy standpoint but lack a steady benefactor. These revolving doors offer some interesting opportunities for fantasy owners especially in leagues that allow daily lineup changes and a fairly high amount of transactions. With a promotion to a spot on a scoring line next to some stars a player can go from a fantasy stud to a must-add overnight.

These openings exist due to a number of factors. This includes a key departure from the team, a lack of an established player to play the role full-time and even injuries that occur during the season, among many other reasons. But as we saw yesterday in Doran Libin's Wild West column, there are clearly players that reap the rewards from these key lineup promotions.

In most instances, the player can give your team a short-term boost in his new role but at some point will run out of steam. Then another player will be swapped into the spot. However, sometimes a keeper emerges and becomes a fantasy mainstay over the long haul. This is why we take chances on waiver wire. The boost given to your team by turning a simple claim into a legitimate producer can make all the difference in whether or not you win your fantasy league.

Today we will look at a few revolving door situations in the Eastern Conference.

Boston

The Bruins have had a very lackluster start to the season primarily due to injuries. However, they have also not been able to make up for the loss of Jarome Iginla last summer. While Iginla has clearly not been as good this year, his 30 goals last year were tied for the team lead.

So far this year the right wing spot next to David Krejci and Milan Lucic has been a revolving door. Even though Krejci has missed many games due to injury, looking at his line combination frequency gives examples of the different players tried on his wing:

While Seth Griffith has seen significant time (and all six of his even-strength points) on the top unit, he is not currently not in that role currently. That honor belongs to Craig Cunningham who to date has just one point in nine games.