I use Q-tip BRAND shafts, shove in the hole, break back, and screw in.
If still not quite tight enough, back out screw and put another piece in.
If more than 2 are needed, another method might be better, but I have fixed tons of route machines w this method, and the screws hold great, can be tightened to a good torque, and it lasts, even on route.,even on flipper assemblies.