sugru is a silicone rubber that can be shaped like clay by hand and adhered to various materials. After solidifying overnight, it will change to a flexible heat-resistant and water-resistant material.
Also, according to the sugru community, the hand of a LEGO minifigure is the size that a Lightning cable etc. fits perfectly. It is said that you can enjoy it as a cable holder by attaching it to your favorite place with sugru. Since LEGO is made of ABS resin, it seems to be a particularly compatible material.
Not only active LEGO fans, but also those who can't easily throw away their childhood collections should give it a try.