Lets get this straight. You want a spare part for a mower but you have decided not to say what the make/ model is.
Start with a Gooogle search for "make model spares" (replacing "make Model" with your own details)and see if there is a parts diagram on any spares supplier site.
Flymo are pretty good in that respect but, of course, you decided not to tell us what your own mower is.
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October 2017