Adjusting tools ETACHRON special tools to remove the stud from the stud holder and to turn the stud. NOVODIAC special tools for removing and replacing Novodiac brand shockproofing springs. Bergeon - Swiss Made. Subgroups ETACHRON fork nameVersionadditionitem No.ETACHRON forkstud holder toolfor pressing out513374 ETACHRON blade nameVersionadditionitem No.ETACHRON bladestud holder toolto regulate513372 NOVODIAC namemanufacturecalibreitem No.shock-absorbing toolNovodiac2660,2671,2688513376shock-absorbing toolNovodiac2801, 2824-2, 2834-2, 2836-2513375