lol
I am now using Tamiya 501X slipper pads in the B4 - they are similar or better than the white AE pads and cheaper too. They have a nicer slip with less 'stickyness' to the action.
As for replacing them, when they get a glaze on the surface they tend to become a little less fluid in their motion. I've never had a B4 slipper back off personally
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