Does anyone know how to put Scrap x2 but not to use "magicLoot" plugin?
Is there any other smaller plugin or some other way?

Why not use it? What's wrong? You can try loot plus but I doubt it's any easier. But you can modify scrap ONLY with it and poof

Because it hasn't been updated for several years and the plugin is very large.
I need something else just for Scrap.

It's a bad idea to have a plugin "just for scrap", because it is basically making a plugin per item. Is it really worth it? And it doesn't matter if plugin is large or not, it will anyways do the same as the "only scrap plugin" if it's done properly by the developer and the server owner.

Maybe https://umod.org/plugins/loot-multiplier or https://umod.org/plugins/simple-loot would be 'light-weight' enough for you.