My 'new' to me Moulton APB has a Thorn seat post and a distance tube about 100mm long in the seat tube. Both are aluminium.
I took the seat post out while I was fiddling with other parts. It was stiff to remove and now it is stiff to get back in.
I have cleaned the seat post thoroughly and the distance tube as best I can.
Is there an easy way to get it in?
Is it ok to grease it? or thin oil, perhaps?
Any advice very welcome. It is a long time since I had a problem like this and I cannot remember the cure.