Howard Jones
Supporter
Have been looking for a source for drilled head safety wire bolts and other hardware with drilled heads with the ability to supply all sizes. There are several aircraft certified airworthy paperwork type but for most uses they just cost too much. So I tried these guys and had my bolts in two days.
In any case here they are.
https://drilledheadbolts.com/
In any case here they are.
https://drilledheadbolts.com/