Hello,
Just wanted to give a follow up/upgrade path to this. Did some research on a better O-ring material, with excellent abrasion and weather resistance: Polyurethane. You’d need 7 of these Dash 118 for around the bearings and three of these Dash 202 for the motor. Almost month in and going strong.
The caveat: They are not cheap from an O-ring perspective (~15). But for a $1600 equipment, I’ll take it!
Hope this helps someone.