Use of a stepped ferrule is the only way to ensure the secure seating of your front or rear gear cable into the guide.
*NOS Vintage 1970s MAFAC stepped end ferrule for centre-pull brake cable housing
Stepped Ferrule Vintage Bicycle Frame Divers Helmet Gear Cable Guides
Spoke Front Wheel 14"x2.15 Rim For Surron Light Bee X For Talaria Sting MX3 RMX4
GIPIEMME Rim 716 Disc 28" 700C Aluminium Rims X2, See Picture For Details
Genuine Shimano SIS-SP40 Outer End Cap (for 4mm Gear Cable) - Ferrule - 10 Pack
Shimano Inner Cable End Cap for Brakes (100pcs) - Y62098040 - 1.6mm Ferrule