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I have not worked on very many basses... but a 1/2 size, apparently with a buzz, showed up in my shop yesterday... 3 questions... because if the problem buzz is with the bass bar it will not be worth it to open up the instrument. 1- This bass is a student Pfretzschner plywood bass and the client got it as a donation from a school who said they thought that the bass bar was loose causing a buzz. I have inspected the bar thoroughly with good light and mirrors while tuned to tension. There is only one short area where the glue seems to have a small crack, but it does not seem to move under pressure and it is near the center of the bar on the bass side. The ends seem firmly fixed. It seems unusual that the bar would be loose in the middle and not the ends.... is it likely or even possible that the buzz can come from here. There are lots of loose slivers and pieces of ply around the edges that to my mind are the source of the buzz. 2-Do all tailpieces follow the standard sizing?... ie this unit has a Thomastik 4 adjuster style tailpiece that looks monstrous... but it is only 287 mm long compared the the standard 1/2 size tailpiece length of 310mm. The standard length of a 1/4 tailpiece is 290mm. I could not find sizing info on the underside of the tailpiece. so I am wondering what size of tail piece is this? 3- The tuning gears are in serious need of lubricant... what is appropriate to use? Thanks for all your help!.... Mat