diff --git a/src/assemblers/scatter_to_triplets.jl b/src/assemblers/scatter_to_triplets.jl
deleted file mode 100644
index 01d83e1..0000000
--- a/src/assemblers/scatter_to_triplets.jl
+++ /dev/null
@@ -1,63 +0,0 @@
-# This file is a part of JuliaFEM.
-# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
-
-"""
-    scatter_to_triplets!(cache::COOCache, Ke::AbstractMatrix, dofs::AbstractVector{Int})
-
-Scatter element stiffness matrix to triplet arrays **in-place**.
-
-Appends all (i, j, value) triplets from element matrix to global triplet arrays.
-Updates counter to track current position.
-
-# Arguments
-- `cache`: COO cache with triplet arrays
-- `Ke`: Element stiffness matrix [ndofs_elem × ndofs_elem]
-- `dofs`: Global DOF indices [ndofs_elem]
-
-# Zero-Allocation Guarantee
-
-Writes to pre-allocated triplet arrays. No new arrays created.
-
-# Algorithm
-
-```julia
-for (i_local, i_global) in enumerate(dofs)
-    for (j_local, j_global) in enumerate(dofs)
-        counter += 1
-        I[counter] = i_global
-        J[counter] = j_global
-        V[counter] = Ke[i_local, j_local]
-    end
-end
-```
-"""
-function scatter_to_triplets!(
-    cache::COOCache,
-    Ke::Matrix{Float64},
-    dofs::Vector{Int}
-)
-    ndofs_elem = length(dofs)
-    counter = cache.counter[]
-
-    # Check capacity
-    new_triplets = ndofs_elem * ndofs_elem
-    if counter + new_triplets > cache.capacity
-        error("COO cache overflow: need $(counter + new_triplets) triplets, " *
-              "capacity is $(cache.capacity). Increase cache size.")
-    end
-
-    # Scatter element matrix to triplets
-    for j_local in 1:ndofs_elem
-        j_global = dofs[j_local]
-        for i_local in 1:ndofs_elem
-            i_global = dofs[i_local]
-            counter += 1
-            cache.I[counter] = i_global
-            cache.J[counter] = j_global
-            cache.V[counter] = Ke[i_local, j_local]
-        end
-    end
-
-    cache.counter[] = counter
-    return nothing
-end