The gins float worked reasonably well, but the olive floated to the top and had to be pinned down with two (!) cocktail picks. Amusing if rather inelegant. Given the often Heath-Robinson nature of technology at the time, this does not seem inappropriate! The hidden depth charge is scrumptious. Like a Turkish coffee, I didn’t drink the last dregs of basically pure grenadine.
I also prefer a 2:1 Sloe gin: Dry gin version, like the original version. Watch your Grenadine syrup amount because it can throw it into a "too sweet" version. I used less than 1/6 oz /5 mls Grenadine syrup (home made) and it was pushing the sweetness envelope. I also added 2 dashes of orange bitters since I was out of fresh oranges to squeeze an orange peel. Overall, a very nice cocktail. The Sloe gin is very prevalent with a 2:1 Sloe:Dry gin version and it was very nice evening/fall cocktail