HELP!! Bought a 2014 bear td riser - my limbs dont fit!

[Calmb4tehPwn]

I did attempt to file a slot across the top, but as there just isn't enough room to get any part of a file with teeth in there, I've just been using the pointed tip of a flat file. I made some.progress over the course of several hours, probably half of what I would.need to actually get.enough bite with a screwdriver, and gave up. It's an absurd amount of work. I'm getting in there to tap a pilot hold and using an easy out.