Well, while looking for videos i saw pretty complicated setups (for redstone douches) that uses detector rails and such. Whatever if it is easy or not, i wouldn't use it as it is as cheaty as a mod almost everyone knows. EE2/3
Dupeglitch + Enderegg (would even work with Anvils if they werent a Tileentity, and why the fuck are they a TileEntity?) + EE = Ultimate EMC-Source
Docm77 did a good Sandduplicator. JL2579 did a Video with him on how to fix Sandduplicators. German Overengineering FTW.