I had to replace mine on my previous 1994 Plus 8 and used a vice with guards on and and adjustable 6" Bahco wrench with taped up jaws, it is a heart in the mouth moment for sure but it does work.
Good luck Tim.

2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev