I'm currently researching, educating myself on small Walbro carbs...specifically WT410 carb in an Echo blower for the 'scape guy (this now my 3rd piece for them)
The model number scribed on an inner carb body surface, makes parts or replacement a breeze. Very affordable kits.
I've cleaned filters, inside of tank, spark plug (confirmed spark)....obvious this thing has sat dormant...aside from rock hard carb pump diaphragm and old consumables (justifying replacement) .... this thing will run. I've ordered a carb kit.
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SibSerge this may interest you.....as you were quoted $120 USD for a carb rebuild? A NEW Walbro carb is $68 USD on the 'bay for this Echo. Don't know exactly what you are working on there (need make/model of specific carb) but I'd steer clear of the place that quoted you (generally) 2x what a new carb would cost. And my carb kit was under $10 shipped.