Are "tight links" still the problem they onece were? These days a loosening shelf, if used too much, is an invitation to chain failure. The CT-4.2 is intended strictly for 9-speed and later chains and these are always joined with a special pin or a master link.

I've connected Shimano chains from 8-speed through 10-speed using their supplied joining pin and never had a tight link when the chain was connected.