Hey Mick, I would be totally fine to get it back for any upgrades. Seriously. It is developing as it goes...and I would be more than happy to re-work anything.
In fact, I wish you would... why not??
Did I send you one of those new knobs?
Actually, there are three different types of knob, your choice..
send me an email or PM... I'll be glad to get one out to you...