Where are the S-A experts when you need one?

Perhaps you should just get a Shimano Nexus with a roller brake or get rid of the Internal Geared Hub altogether and get a derailleur. This ancient Sturmey Archer stuff cannot be fixed.

Ok, I am just saying that to see if that wakes anyone up.

GamblerGORD53 , Dan Burkhart , southpawboston , 3alarmer , Andrew R Stewart , Sixty Fiver

I haven't seen Sixty Fiver in a long time. I don't know if this mention will ping his email. It may be worth a try.

I don't know if you are experts, however, I noticed that you responded to Sturmey Archer questions in the past. I think there are members here that are familiar with the planetary gear system inside the hub, but that the drum brake is a less familiar issue. That is too bad because Sturmey Archer has been making these drum brakes for a long time and for the most part, I think that they probably have few problems.

Being in Holland, there are probably some experts there, but how to find them, other than going to a bike repair shop and perhaps having to pay someone to make it their problem, I don't know.

On the front brake, could it be that there is a bushing or something that is worn that allows this "stick - skip" sound/vibration that you are getting?