My guitar i just got for Christmas has an accessory at the head of the neck. I know what it does because my friend has the same thing on his and I'm trying to figure out what it's called. It needs alan wrenches to tighten down onto the neck to hold the strings in place so they don't get out of tuned. I know that you have to adjust it and loosen it up to tune the strings but what is it called?
polhemus
A capo is used to clamp each and all of the strings for the duration of one agonize so the open notes exchange into despite the fact that that agonize is, despite the fact that this is not any longer used to maintain the guitar from going out of song. despite the fact that, there's a locking nut it incredibly is designed for protecting the guitar from going out of song. the two may be offered at almost any guitar shop however the locking nut might could be matched on your guitar.
Wonderless
That is called a capo it is a clamp fastened across all the strings of a fretted musical instrument to raise their tuning.
Anonymous
It sounds like you have a capo, but a capo does not require allen wrenches, so I'm not sure. Here are pictures of capos:
http://images.search.yahoo.com/search/images;_ylt=A0PDoS4AhPhO4ysAbwWLuLkF?p=capo&ei=utf-8&iscqry=&fr=sfp
garima
It's called a CAPO.