Many helpful answers already but another idea for you. For accurate placement of CA glue, make some lengths of heat stretched sprue, different thicknesses etc. Use the thick part too hold and with a wee pool of CA, collect required amount on the thin stretched wand and accurately apply to your part to be joined. As you have bought the kit, the left over sprues are waste, so you are being sensible in making use of the waste and all it takes is a lighter/candle to stretch and make as many applicators as you desire. Just don't burn yourself on the hot styrene.