Right, but how exactly do I notify them? When? Do I need to hear back before using the equipment?
Here's what a TTB presentation says:
Change in Construction or Use of Buildings and
Equipment
• When a change in construction or use of
buildings and equipment(other than changes
to or alternating premises) occurs:
– Prior to change – file letter notice
– Must incorporate changes on the next amended
registration TTB F 5110.41 filed
27 CFR 19.193
What does this letter need to look like? "#XY1234656, column reflux, 123 gallons"? Just that? Updated drawing, or does that wait for the next [yearly?] registration?