Soldering bullet wire ends to socket

[Clem Clement]

I'm reading the some of us solder their wire bullet end to the socket to guarantee a secure and good fit.

I have to replace the dash light dimmer switch. The bullet ends on my replacement wire harness will not fit in the socket. Solder does not stick to to the socket sides which I filed clean

It is common practice to solder these connections. Does it pass during judging?
TIA