SOMEONE HAS TO FIND THE DUPLICATE GLITCH ALREADY...IVE SEEN THE ARMOUR ONE BUT I WANNA DUPLICATE SWORDS SO IF U KNOW HOW TO DO IT REPLY PLEASE ll
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Get last perk in Pickpocket tree.
Pickpocket bow from Follower.
Reverse Pickpocket new bow onto follower.
Get Arrested.
Pickpocket new bow from follower.
Get Arrested/Switch Cells.
Voila!

why would you even need a duplication cheat, with 100 smithing you can make any weapon you want, combine this with enchanting and alchemy and you can make a stong weapon with any enchantment you want

Not Blades Swords.

I was so mad when I couldn't dupe the Jagged Crown...

There's 8 or 9 blades swords I see no reason to need another.

I give them to my buddies as a sign of friendship.

Yeah but you can get 6-8 of them just by doing the main quest, plus there's an enchanted Blades sword to be gotten in the game as well so that's a total of 9 that you can get in game.
As far as duplicating goes, I find it messes up your game because your forcing a glitch and the more you do this the buggier the game becomes, from my experience.

if on the PC... console command player. additem (item number) ### number that you want. I do this for Daedric arrows... I believe you can get the Blade's sword this way as well.

You can have just about anything that's in game with console command

Yup. I played the hard way (the right way) when Skyrim came out. Since Nov until now on my PS3 I worked for everything my characters got. Finally got a PC worthy of Skyrim and I've spoiled my new characters rotten... console commands high lv daedric armor for my lv 1 character still in helgan haha.

And I don't feel guilty for one second. I earned this haha.

it the same way with me and the ogham glitch

Just tested it with the Dawnbreaker and it didn't work