It is common that after market mechanisms have a different screwhole pattern from the original and therefore require adapting. A popular method is to attach a mounting board to the bottom of the chair seat. Use the original existing mounting holes to attach the board. The board should be about at least 1" wider and 1" longer than the mounting holes. If you have any hard wood, you can use 2 1" x 2" strips instead. 1" longer attachment screws or bolts are usually needed.

Adding this small amount of wood thickness under the seat does not usually cause any problem. However, the added wood thickness will cause the chair seat not to go quite as low as it once did due to the added wood. If that is a problem, please call for instruction.

Attach the new mechanism to the wood using large head #14 oval head wood screw 1" long. (Style #6090S) See, Overview of Mechanism install and Pivot locating tips for proper positioning. Should new mechanism screws or bolt position interfere with mounting board attachments, countersink or counterbore them. Do not install new mechanism screws any closer than 1/2" to the mounting board screws. Further is better.

Curved bottom seating:
If your chair seat bottom is curved preventing the mechanism from lying flat to the attachment holes, follow this procedure.

• Using the original mounting holes, you may need to attach two 1/2" x 2" strips or wedges of hardwood to bridge the gap between the seat bottom and the mechanism plate to prevent the mechanism from being forced to bend when attachments are tightened. Longer screws may be necessary. It is best to support the mechanism from front to back rather than side-to-side.

Additional important information: Mechanism placement