MFK93 wrote:i tried to made 1..but screwed everything..i used a rough sand paper and filed it untill too loose..Got any idea of what i can use to file?
Oh man... you should control how much you want to file...

It doesn't matter you use rough one or not. You must always do some testing after you file a bit, to see whether it can fit in or not or how much can it fit in, if can't, then only you file a bit more.
BTW, i usually use the tool that is for fingernails(i forgot what it's called) because if everytime have to use sand paper, that will be a waste. I only use thin sand paper to touch up where i filed(if needed).
Anyway, if it's a bit bit loose doesn't matter, i don't recommend to make it to fit very tightly because super glue dries WITHIN SECONDS, there is higher risk that you will stuck and ruin the work and waste the materials when you're using super glue to glue it.