I was not sure the Explorer II had an issue with the arm rests like the XS did, but I went thru 3 of the factory made XS arm rests and years ago (about 6 I believe) someone on this forum showed a homemade armrest made from PVC pipe. I did that six years ago and it has worked out GREAT. Never broke another arm rest and the PVC one actually gives some needed support while swinging, but the main point is, no breaks in 6 years of hard usage.
If asked for I will photograph mine or look for an old photo if anyone is interested.
Don in South Jersey
Explorer XS