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So I know I've recently posted a similar question to this, but the application is a little different. I routed mt neck for two crabon fiber rods and a single action truss rod. The wood jumped off the fence twice during the routing of the slots for the carbon fiber rods. The excess cavity is not enough to be fill-able with wood, but are big enough as to where Im wondering if it NEEDS to be filled. I would kind of like to fill with epoxy, but Im hesitant because Im worried that having pockets of epoxy in my neck will damage my tone. What do you guys recommend? Alex

Pix would help, but it's probably not a big deal.

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"Act your age, not your shoe size" - Prince

Heres an earlier pic. My concern is the two spots on the sides of the channels for the carbon fiber rods. You'll see two spots wher the router clearly came offf the fence

Epoxy will fill the voids and not hurt tone. But you need to get your router under control before you hurt yourself. Are you trying to cut the slot in one pass?

I did the routs for the carbon fiber rods using a router table with a cheap-o chinese spiral bit. When the bit can acroos the joint between each curl, I could feel it kinda curl and jump a little. My truss rod slot was cut using a bosch straight cut bit and I had no problems (on all routs I made multiple passes).

Could you be using the fence on the wrong side of the bit, or feeding the wrong direction? That would explain why the wood pulls away from the fence. If you go the correct direction the bit should pull the wood to the fence.