Safety requires that for the emergency handle changes in form , fit and/or function are part of the change process.Could you please check within BST whether the contract with Schaltbau ensures the safety requirement. Or : if these can’t be ensured the emergency handle needs to be a traceable items. Information from Steffen Scheffler:The emergency brake handle (inside) is coming from Schaltbau (NC-000-0001-2927) and is chosen by BT Drawing, purchasing and installation is in BST so far.