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Made for a feed slot cut of 56mm x 17.5mm
Place a 1/16" drill bit in drill guide hole of nipple pin.
Center insert within the feed slot.
Strike the drill bit to mark the back web of the channel.
Remove the insert and drill a 3/16" into the marked location.
To remove metal burrs, use a slightly larger drill bit to hand turn over the hole to smooth edge.
The insert can now be installed and the nipple pin will prevent the insert from sliding.