Ok so I am new to this...just joined and this is my very first posting So...... I just bought a Fender 1970's vintage series Jazz bass, and I am looking to upgrade and custom this bass. I have found a BA III and I am looking to change the Machine Heads....reading some old threads I see that Hipshot Ultralights are what most recommend, but what I want to know is will I need a 1/2 or 3/4 bushing. I don't have the bass as of yet as it is on order, but the store I bough it from said they would change the machine heads and bridge free of charge if I get them before they do my set up. Ps if anyone is interested I am looking to sell a Ibanez Sr300, you can email me.