Head doctor fitting issues

Hi has anyone had any problems getting one of these buggers to fit, I have the wedge dangling down, it just looks too wide for the steerer tube, id say about 1mm, are big grippers required to really squeeze in the o ring part?? The YouTube video has the guy just push it in with his fingers! I think I could beat it with a hammer and it would just mash the fitting, which is tempting!!! Any tips appreciated.
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but as above. fit a starnut.
Parktools :?:SheldonBrown
De rosa superking 888 di2