Jeff Wisnia wrote:

....
Oh, and those top caps on the Delta faucets can sometimes be bears to
unscrew. Slip joint pliers work, If you don't care about marring the
nice knurling on them. I've never had any luck wrapping them with
adhesive tape first either, the plier's teeth cut right through the
tape. Much better to use one of those "boa" strap wrenches for that part
of the job. If you don't have one already, they really are the cat's ass
for jobs like that.
....

I just wrap an old wash cloth around and "grab holt"...the pliers will
still hold and marring will be kept to a minimum at worst...