We just purchased a home built in 1958. It has the old roll-out windows. The previous owner left the dual panes to be put up in winter. He didn't leave instructions on how to install them:( We found some J-shaped clamps that look like they go with it but not sure. One side of the frame(on the dual pane) has weather stripping and the wood frame looks like there might have been a track it popped into. No one I know has this type of window so I haven't been able to get any help. Any info will be appreciated! Thanks.