How would I make a "Glue" script?

I'm trying to work with glue to make a rope. I edited a weld script so it would create glue rather than a weld, but this causes the bricks to fly off the map and go all over the place.

function weld()
    local parts,last = {}
    local function scan(parent)
        for _,v in pairs(parent:GetChildren()) do
            if (v:IsA("BasePart")) then
                if (last) then
                    local w = Instance.new("Glue")
                    w.Name = ("%s_Weld"):format(v.Name)
                    w.Part0,w.Part1 = last,v
                    w.C0 = last.CFrame:inverse()
                    w.C1 = v.CFrame:inverse()
                    w.Parent = last
                end
                last = v
                table.insert(parts,v)
            end
            scan(v)
        end
    end
    scan(script.Parent)
    wait(1)
    for _,v in pairs(parts) do
        v.Anchored = false
    end
end
weld()
script:Destroy()

Apparently, I need to define the "F" points. How would I do this, and what would the finished script look like?