It is important for you to be aware that the aglets on commercially produced laces, such as those that come with new shoes, are produced using ultrasonic heating or plastic moulding machines that cost hundreds of thousands of pounds. It is consequently unlikely that your home produced laces/aglets will have a similar professional quality but the use of this heat shrink method is however universally accepted as a safe and, to most people, reasonable alternative.
Please read the comments of many satisfied buyers in our feedback profile and buy with confidence