Take a little sandpaper or even an Emery board to the bottom of the screws, that often helps. Make sure the wires in the hole are side-by-side when you insert the legs to ensure even screw pressure on both coil legs. And remember, the screws
don't need a lot of torque; a good test to see if they're tight enough is to wiggle the legs (before you trim them) and see if the coils move. If they don't, it's tight enough, if it does, tighten just a bit more, test again.
If all else fails (or you're using Ni200), you can double the legs; leave them longer than normal, fold the legs in half almost back to the coil so that the leg is "stacked" double (and feel free to trim the end near the coil if it looks like it might contact), then insert and tighten as normal. You've essentially made a spacer out of that extra wire, making it less likely to get cut by the screws, and it has no impact on resistance or conductivity.
As far as having trouble taking it apart, be sure to lube the everlovin' hell out of it with
juice, even the outside so that juice gets in the tiny gaps where the AFC and juice flow rings spin. Do that and it's a helluva lot easier to take apart, or operate.