haha woops i reread it wrong the first time, on the hydraulic roller the plunger where the pushrod sits into will be able to sink down, but you might not be able to with ur fingers if theyre not bled down, these will have a clipring to hold the plunger in the bore of the lifter. and the solids are just plain solids they just have a hole in the top of them for the oil to go through to the pushrods.