Counter-Strike: Source skins in Garry's Mod problem

Hello, I’m sure everyone that’s play’s a gamemode on Garry’s Mod that uses Counter-Strike weapons, has gotten or wanted to get skins for them. Now, since these weapons aren’t skinned specifically for Garry’s Mod there are problems. The most common problem I get is left handed weapons. I know in Counter-Strike if you get the left handed weapon skin problem you just have to delete the weapon_<weaponname>.txt in the scripts folder, that doesn’t work. Neither does changing the value of “Builtrighthanded” to 0. Is there any way to fix this problem besides getting new skins?