You don't have to purchase a new one. Parts for it are available. This online parts house is good. If you are saying you need the plastic bubble for the carburetor, it is here.
http://www.ereplacementparts.com/homelite-misc-parts-c-18807_24213.html
There are 3 models listed. They are listed in the 4th section of misc. parts and are items 9,10, and 11.
All the other parts for your machine are listed here too:
http://www.ereplacementparts.com/homelite-ut21506-mightylight-string-trimmer-parts-c-18807_20299_64844.html
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I'm not sure what part you are speaking of. Where on the machine is this "bobble" and what does it do? There are no parts called "bobbles" on weed trimmers.
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