is it okay if i sand the bridgesaddle of my guitar with a nail filer to lower the action? i’ve heard that the trussrod is not suggested for lowering the action and neither is the nut.
No,If this is an acoustic guitar you need to take it to a shop,if its an electric with a fixed bridge then the 2 large mounting bolts raise or lower the bridge height.Which adjusts the action(partially)
One of the other answerers is trying to say that by sanding the bridge saddle of a string you will screw up the intonation.This is why if it is an acoustic it needs to go in the shop.The tech will put a different bridge or saddle and adjust as neccessary for the action and intonation
IF this guitar has a floating bridge then you can see if one of the bridge saddles is to high compared to the rest.This is because some people pull them off while cleaning the guitar without realizing they have a specific order.If this is the case with your guitar,your intonation is already screwed up.but you can try to fix it bymarking the spot each saddle is along its set screw.then pull all of them off and lay them on a hard flat surface(as if they were on the guitar) you should then put then in an order that makes a smooth arch(arch matches the fretboards/fret radius) when you look at the saddles on edge.then replace them in that order on the guitar.You might get lucky and the intonation will be fine if not take it to a tech a he can set the intonation.but at least he wont charge you for realigning the bridge saddles.good luck
Acoustic Guitar Bridge Saddle Shave
Guitar Player Repair Guide
Whether you simply want to maintain your guitar or hot-rod it into a radical new incarnation, this book is the ideal guide. By the columnist of Guitar Player’s popular Repairs and Modifications column, this comprehensive book is a must for any guitarist who needs information on beginning repairs through advance enhancements. 8-1/2 inch. x 11 inch…..
The Acoustic Guitar: Adjustment, Care, Maintenance and Repair (Volume I)
A good guitar repairman is hard to find, and when found, a long waiting list seems inevitable. Those who have confronted this problem may now turn to Don E. Teeter’s encyclopedic treatment of guitar adjustment, maintenance, and repair. Profusely illustrated with line drawings and photographs and written in a clear and straightforward style, this book takes the reader on a guided tour of the acou…