Glucose

7 g1 teaspoon

21 g1 tablespoon

Liquid glucose density ~1.4 g/ml; 4.93 ml/tsp gives ~6.9 g.

Instead of Glucose

Glucose’s thick body and anti-crystallising effect are not fully replaced by ordinary sugar.

Golden syrup
Use the same weight. It has a slight colour and flavour but similar anti-crystallising effect.
Sugar syrup
Use the same weight and reduce other liquid slightly. It is less thick and may crystallise more easily.
Caster sugar
Use the same weight dissolved in a little warm water; add a pinch of cream of tartar to help stop crystallisation.