locking device or handle set replacement

A quick learner from Vallejo says:
I need the plastic locking device or a whole new handle. Any suggestions? You can also call 707-643-6304, thanks, Austin
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Dave Sr. from SWISCO responded:

I am afraid we no longer supply the thumb lever for this part by itself. You will need to replace the complete handle set. The best option we have to offer is our 82-033. Look it over and see what you think. 

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