Callaham Trem Arm, Virtual Pop-In (LH)

These arms are left handed. 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 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 designed for use only with Callaham blocks, they are not appropriate for use with Fender blocks. Use Callaham's fully-threaded arms for Fender blocks. Callaham's pop-in arm has a shortened thread length compared to traditional arms (see photos). It is therefore unthreaded where it bears against the Delrin bushing in a Callaham block, and this allows you to push it in, then spin it once or twice to engage a thread or two. The threads are there simply to keep the user from inadvertently pulling the arm out during use. So the arm is virtually a pop-in design (tho