Safety wire question: Oil fiter cover bolts

[Adam R]

These look like PIA bolts to drill.  Is there a special trick to them?  How is silicone sealant viewed?

Someone suggested drilling through the top of the acorn nut two times at diagonal angles.  I haven't tried this yet because safety wire is not required for the practice day but it is for the novice school

Adam

[JamesG]

They aren't that hard. You can drill across the dome section just once and then wire the nuts is a triangular pattern. That is enough to keep them from turning, which is the whole point of saftey wire.