Sorry Chris... There's nothing under the 'foot' of the pipe, just a plain hole in the strut body... The 'foot' (which is integral with the rubber pipe) just covers the hole. The only thing you have to be careful of is that the foot is placed centrally over the hole as there is nothing to help alignment..
If the strut tops are only just beginning to go rusty then have them off, strip away the rust and the rubber coatings and rustproof them quick and they can be saved...
Good to hear all back on the road now

Did the car cause the holiday cancellation of was the 'staycation' a choice?