How to replace motor belt for Rollei P83, Silma S112 film projectors

How to replace the motor belt for the following projectors:

* Rollei P83  parts: https://van-eck.net/en/spare-part-fin...

* Silma S112 parts:  https://van-eck.net/en/spare-part-fin...

Required tools:
Screw drivers
Spring hook  https://shop.van-eck.net/ET-0001.html...
Lubricant Molykote G-4500 https://shop.van-eck.net/?_globalsear...

We offer spare parts and repair services for slide and film projectors.
Also we offer digitalization service (up to 4K with film restauration) for 8mm and 16mm films with advanced services like mold removal from films.
See https://www.van-eck.net

Music: https://www.purple-planet.com