I have been looking for a way to adjust my lights up and down for when I do tank maintenance. I ran across these and wanted to see if anyone has ever used them. I'm just worried one day the lights will be dunked in the tank if the suspension wheel inside gives out.

http://www.google.com/url?sa=t&rct=j...49478099,d.eWU

http://www.ebay.com/itm/4X-Yoyo-HPS-...#ht_5014wt_986