9v input question

[realizewhoitis]

I have never used this tyoe of 9v input and i was hoping someone could tell me how im supposed to mount it http://www.pedalpartsplus.com/mm5/merchant.mvc?Screen=PROD&Store_Code=PPP&Product_Code=6004&Category_Code=JAC
I thought the nut unscrewed but if it does im having some trouble

[punkin]

Drill hole in enclosure..insert jack from the outside and install screw-on back nut from the inside until secure.

[realizewhoitis]

Drill hole in enclosure..insert jack from the outside and install screw-on back nut from the inside until secure.

so are you saying that the nut on it does unscrew?

[rosssurf]

Yes it does. maybe it's just a little stuck on there.