Callaham Trem Arm, Virtual Pop-In

Callaham's Virtual Pop-In arms are designed for use only with Callaham's Enhanced Vintage blocks. These blocks are used in all of the Callaham trem products we sell, including complete tremolos, and upgrade kits. Enhanced Vintage refers to the fact that Callaham inserts a Delrin sleeve into the block's arm hole, which mitigates any play in the threads, resulting in a better trem feel. Note: These pop-in arms are not appropriate for use with Fender blocks. Use Callaham's fully-threaded arms for Fender blocks. Callaham's pop-in arm has a shorter threaded area than traditional arms (see photos). It is therefore unthreaded where it bears against the Delrin sleeve inside the block so that you have full contact between the sleeve and the arm, eliminating play in the arm. This allows you to push it in and use it, often with no need to screw it into the block. If more aggressive users find they inadvertently pull the arm out of the block occasionally, they can spin the arm a couple of times to