Hi! I remember reading a post on the OpenBeam blog which mentioned how to properly lubricate the MGN carriages. here is the post http://www.openbeamusa.com/blog/2013/09/24/linear-rails The thing is that the rails come with some preservation oil which should probably be removed and re-greased using a proper (like lithium) grease. The post mentions a how-to video, but there is no video or link actually present. So the question is - how are you guys lubricating the rails/carriages? do you have any "jig" for that? I would appreciate any help, thanks!