Handrails can be repaired and replaced. Not only with old installations but also with new ones.
When do you need a handrail technician:
When an escalator or a moving walk is extended the handrail must be extended as well;
From the factory installations are sometimes (consciously) delivered without a balustrade, and so without a handrail;
Handrails can be damaged in the long term wherefore replacement is needed.
A handrail in origin exists of two lose ends. To create a closed handrail, those ends need to be attached by vulcanising.
The vulcanisation of the handrails is a process were the two ends of the handrail are melded together. The pre-process of vulcanising is a specialised process of cutting.
A new handrail, without any visual marks of replacement or reparation, is the result.