How to remove a specific leg of a mirror?

Issue

I have a volume group that consists of five physical volumes. I have added one large physical volume to the volume group and created a mirror via 'lvconvert -m 1 --corelog....'.
The volume group currently looks like this:

# vgdisplay -v dcon1
    Using volume group(s) on command line
    Finding volume group "dcon1"
  --- Volume group ---
  VG Name               dcon1
  System ID             
  Format                lvm2
  Metadata Areas        6
  Metadata Sequence No  34
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                6
  Act PV                6
  VG Size               2.74 TB
  PE Size               4.00 MB
  Total PE              719350
  Alloc PE / Size       670704 / 2.56 TB
  Free  PE / Size       48646 / 190.02 GB
  VG UUID               ae5UGs-cds5-eox2-8X5S-mLSA-B6Yf-RMsQNP

  --- Logical volume ---
  LV Name                /dev/dcon1/dcon1
  VG Name                dcon1
  LV UUID                EVYpx0-9dbk-YtrP-gWLs-99pj-iCH4-7wXW1T
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.28 TB
  Current LE             335352
  Mirrored volumes       2
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:21

  --- Physical volumes ---
  PV Name               /dev/mpath/350002ac003d505b8p1     
  PV UUID               uRC6hB-fa7M-ebBR-abI5-2zRd-bd11-4e8zNb
  PV Status             allocatable
  Total PE / Free PE    51199 / 0

  PV Name               /dev/mpath/350002ac003e705b8p1     
  PV UUID               aChVsh-j0AH-gUXf-c5cr-RGcR-GBYx-bFF8A9
  PV Status             allocatable
  Total PE / Free PE    76798 / 0

  PV Name               /dev/mpath/350002ac0041205b8p1     
  PV UUID               Mg3fAi-D7Ee-vwN5-A8zs-agx0-rLwQ-EJ1fdR
  PV Status             allocatable
  Total PE / Free PE    51199 / 0

  PV Name               /dev/mpath/350002ac0042805b8p1     
  PV UUID               YLZjau-3nGe-ctW4-lXxY-xmLX-uI0g-F41TsE
  PV Status             allocatable
  Total PE / Free PE    53758 / 0

  PV Name               /dev/mpath/350002ac0043205b8p1     
  PV UUID               kqj1WF-7vFA-4Uee-wCE5-ltIo-9qPn-8izjcj
  PV Status             allocatable
  Total PE / Free PE    102398 / 0

  PV Name               /dev/mpath/360000970000195900557533030353842p1     
  PV UUID               xMTJdP-0cIS-p4sZ-4cgi-NxwB-fi5l-HC0GpB
  PV Status             allocatable
  Total PE / Free PE    383998 / 48646

The device /dev/mpath/360000970000195900557533030353842p1 is the device that was added for the mirror.

Once that mirror completes, I need to remove all the old devices (/dev/mpath/3500*) and leave the dcon1 volume with just the new device (/dev/mpath/36000...).

With the current output of 'vgdisplay -v dcon1' at the top, can you please provide the correct steps to break the mirror leaving the new device active (/dev/mpath/36000...), and then remove the old devices (/dev/mpath/3500*)?