Has anyone tried these??

[tman1986]

i've been seeing these forever on ebay but i dont think i've seen anyone use/try/or buy one yet

there hydraulic pumps for convertable tops, new there pretty pricey but theres many for less then 100$ bucks used that even come with cylinders, mind you i have no idea the flow rates or pressures they run at hence this post

i was wondering if anyone here had any experience with any of these or if anyone happens to know some specs on them

here are a couple of what i'm talking about but they come in all sorts of sizes and configurations

http://www.ebay.com/itm/170817886948...84.m1423.l2649

http://www.ebay.com/itm/280857058890...84.m1423.l2649

any insight / info anyone could throw this way would be awesome
as i'm always trying to save money and theres alot of junk yards nearby that im sure i could scoop one of these from for cheap but i dont want to waste my time, like if someone says there all made with plastic gears for instance

Thanks
Trevor