2/10/2023 I changed to PA12 Nylon with Glass Bead fille for added stiffness fitting of this long insert.
The nipple pins have 1/16" drill guide holes to mark the locations in the feed slot channel.
Remove the insert to drill out the locations with a 3/16" drill bit.
Now you will be able to snap in the nylon insert after you route the side grooves in the feed slot.
Video instructions at :
https://youtu.be/VvgMuhgE8TI
Help:
TomLuQue@gmail.com