Just a small tip with the felt strips.

Rather than a narrow felt strip, I prefer to apply a wider adhesive backed felt strip and apply it to the side of the playfield so that part of the strip can be folded over to the underside of the playfield and secured there as well.

The reason for this is that it stops any chance of the edges of the felt strip getting snagged on the sides of the cabinet/mirror blades when it is raised or lowered and eventually rubbing loose.

I bought these wider felt strips for this exact purpose since you can cut/adjust to a width of your choosing.

http://www.ebay.com.au/itm/2-Wide-Black-Self-Adhesive-Video-Projector-Screen-100-Wool-Felt-Tape-50-ft-/370629974976?pt=US_Projection_Screens_Material&hash=item564b449bc0