Most day-to-day support is handled remotely, which lets Dave review issues without making every question an office visit. If a job needs hands-on work, describe the equipment, location, and timing when you reach out so the approach and any visit arrangements can be agreed before work is scheduled. Your first conversation is also a chance to explain your vendors, staff, and recurring problems.
You can call, text, or use the contact form. For an urgent issue, calling or texting is the quickest way to reach Dave.