Another reason to use a later machine is that they started putting these 'cuts' in the treads ontop of the boiler. This cut is a saftey feature that give you a loud warning if you try to open the boiler cap while the machine is too hot. Older machines will not give you this warning, and spew hot water everywhere when the cap is removed.
filling up the boiler using a silicon funnel
sight glass in action
warming up.
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