I have a two track lift bridge made out of 3/4" plywood, approximately 3' long. I need some sort of way to hold it in the up position when not running trains. I have searched the forum but could not find examples. I tried using chain, but it dug into the wood. I thought of some sort of pneumatic screen door closer, or car truck pneumatic hinge. If anyone does anything like this I would like to see an example on how it is done and the parts required. Thanks.