Can anyone help me?

I have a hat, 3 matches, left glove, razor and locket in inventory. The map keeps leading me back to the safe where you need to enter "ERIC" but I don't have any letters. Any suggestions on what to do next?

If it helps, I know that I need one more piece of the stained glass, the last billiard ball and all but two of the things you put on the sides of the bathroom mirror.

I wouldn't have gotten this far without this forum so thanks to everyone who has posted solutions here.

Finally! I figured out that you get the letters by clicking on the wheel underneath until you find all 4 letters. Now I can move on.