Backcheck Line & Height Jig

This tool is a combined version of two previously-available tools: the Backcheck Line Jig, and the Backcheck Height Jig. All tool versions are still valid and are measuring tools designed to aid in the installation of WNG Composite Backchecks.

This tool is INCLUDED with the Backcheck Tool Kit (06-5919), which contains everything needed to install Composite Backchecks. See video below for installation instructions.

This measuring device is used to find the precise location to install new WNG backchecks in any grand action. This tool is a combination of two tools previously sold separately: The Backcheck Line Jig, and the Backcheck Height Jig. The new Backcheck Line AND height Jig combines the two processes into one; saving space, time, and money!

IMPORTANT: *To maximize the full potential of WNG Backcheck, hammer tails must be modified (if enough wood remains), or new hammers hung with correctly-shaped tails. The original, and newly-redesigned WNG Backcheck Tool Kits include a device for shaping the hammer tails correctly using a belt sander, and are complete with measuring and installation jigs to make using the entire Backcheck System as easy as possible.*

WNG has redefined how Backchecks function in the grand piano. Traditional Backchecks are large, thick, heavy, and function by use of friction. The hammer falls from the string and rubs into and along the Backcheck until it stops. Because of this, the point at which it stops in the Backcheck is determined by the velocity of the hammer. This is what causes the very well-known phenomenon of varying checking distances depending on the force applied to the key by the player.

The WNG Checking System is designed differently. The material portion at the top of WNG Backchecks is less than half the size of traditional Backchecks, and the top is shaped at a specific angle to catch the hammer in a firm wedge. Most importantly: The hammer tail is shaped to a specific length and radius to match. Thus, when the hammer falls from the strings it stops at nearly the instant it contacts the Backcheck with significantly less drag and friction. When the hammer checks this way it will land in the same place every time regardless of force applied to the key. This allows checking to be closer to the strings; even as close as 3/8" at times, enhancing the speed and consistency of note repetition.