Git your vice grip out at wrestle the damn thing out.
Take the plug, a spanner and a measuring device (verniers or such and head for the bikeshops, repco,s Knackers yard and find a similar plug 1 to 2 mm larger diameter.
Take said new plug to engineers supplys shop and buy intermediate tap to suit.
Go home...
Get a block of lard or dripping and start to shove it in the hole,( when cold) it will form a dam to catch the swarf.
Tap the hole with the new tap...or get a fitter to do it if you are not confident.
Hold cigrette lighter to hole with bike upright and butter or dripping will melt and swarf will fall out.
Flush with a little new oil.
Fit new plug and bingo....
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