your cables aren't worth sending to the manufacturer for re-termination. lugs are readily available in all qualities (at least in the us) & are easy to install on your own. if you have trepidations as to your soldering skills, find a friend, ham radio hobbyist or cable dealer to do the job.
Speaker cable termination
I have a pair of old Audioquest Midnight 2 speaker cables and I need to change the termination from banana plugs to spade lugs. Could anyone recommend where to purchase the spades ? Would the quality of spades make an audible difference ? Can I solder it myself easily ? Is it worthwhile to send it back to Audioquest for re-termination ? Thanks.