Surely just a piece of cloth or a handkerchief to lay the parts on? Perhaps the MK1 is the British sense of humour; a bit like the eyeball MK1?
The standard issue Handkerchief Mk1
Pictures from an old (21012) post by Waco.
Mine are not the best, but they are not too bad. I can think of lots of Enfields I'd rather have but instead of constantly striving for more, sometimes it's good to be satisfied with what one has...