Warp wedge bars can shrink and expand depending on humidity and other factors. If the warp wedge bar does not fit securely between the rubber bumpers on your loom, install the spacer kit on one upright of the loom. 

1. Remove the screw holding the rubber bumper to one upright of the Arras Loom. Discard the screw.
2. Place the washer over the hole for the bumper, on the inner side of the upright. Set the bumper over the washer.
3. Attach the bumper and washer with the sheet metal screw included in the kit. Make sure to tighten the screw firmly, so the warp wedge bar will fit into the bumpers.