So I got a protostar and some kitty string as well as some Duncan thin lube to get free postage. Anyway, the protostar played pretty well and I was satisfied with it but I decided to put a bit of the (unresponsive) lube in it (like one drop) and it started to play responsively. I thought that I may just have to work the lube in so I kept playing with it but it still came back to my hand with a reseonable tug (around 10cm+).
I then cleaned out the lube completely and it went back to mostly unresponsive - it does come back with a huge tug but I can live with that. Anyway, do I just keep the bearing clean as it is or is there something that I am doing wrong or is this the fault of the Duncan lube?