Double Espresso on Delonghi Treviso

The way I brew a double espresso on the cheap delonghi espresso machine. It isn't great but I'm trying to get the best out of it before upgrading. Notice there is a problem as when the boiler switches off (and pressure is highest) there is water leaking from the brew head. Not sure which seal this is, any ideas would be helpful. The grinder used is an Iberital MC2

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