Hmm, I think it will have to be fixed properly in place, and not with some penny washers. Seems quite top heavy, and if you'd ever need to brake hard or have an accident it will be more prone to breaking loose.
The lack of any ‘off the shelf’ reels truly able to stand up to the rigours of water fed pole window cleaning
Coxreel, Reelcraft and Redashe better pack their bags!!!
On a serious note, my Redashe 460 reel is engineered much better then that.