Take your time Sasha and get well my friend. We'll wait till you get back to a 100%. Health first, business after. The kits can wait.
And don't worry about your reputation. You're a one-man shop and obviously if something happens to you, it will of course affect the production of the kits. The fact that you're updating us about the delay due to your surgery, to me, means you don't hide stuff from your clients, which means you're an honest and trustworthy person to deal with. Transparency is something that is getting scarce in the automotive industry nowadays, and for that, I tip my hat off to you my good sir
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Get well and keep us posted.