How to fix slates in lead valley replacement? Information, help and tips on many areas of roofing including trusses, tiling, venting, insulation etc....

[Morethan]

I need some help in replacing my lead valley. I have cement slates. The slates will be removed each side of the valley and the lead replaced. But How can the slates be fixed in place as the fixing holes are covers by the old overlapping slates? Thanks