My E10 did not fit well on this caddy. The caddy was assembled correctly, but the Dolphin was not secured in the least. When the caddy was tipped back to move, the E10 slipped backward so that the tracks rubbed on the wheels and it slid off in any direction at the slightest movement. I had to engineer my own adaptor fitting to fit inside the E10 vacuum slot (the only opening on the bottom) to secure it and raise it high enough so that the "channeling" strips and track would not touch anything on the base of the caddy. The fitting is screwed on from the bottom by slightly enlarging the 2 boss holes using screws with small washers to protect the plastic bosses. This picture is before "tweaking" with 2 added L brackets with padding to eliminate any side-to-side tipping. The E10 is now secure and the caddy will be very helpful but I have no idea how anyone could think this would work as produced. Just love my E10 and I would give 5 stars for Sunplay ease of ordering, shipping and service.