I just wanted to say that tax can be charged on transactions of assembly as long as the following happens: "Fabrication labor is always subject to Sales/Use Tax when the tangible personal property is sold at retail. Repair/reconditioning and installation labor is not subject to tax if it is separately stated on the invoice. NAC 372.380, 372.390-372.400 and NRS 372.025 and 372.065" (http://tax.nv.gov/FAQs/Sales_Tax_Information___FAQ_s/).
All of the employees at lock n load have always been nothing but helpful to everyone every time that I've been in the store.