Dave Sr. from SWISCO responded:
September 17, 2014
Believe it or not, no one has ever asked us this question before. I would say 3/8 to 1/2" play for each side. I would suggest fabricating the sash on the tight side and "plane" it down if you have to.
I have used these in the past for repairing wood sashes with a chain weight system. They did work quite well at holding up the wood sash. I would also recommend using at least two per sash and possibly installing two more on the bottom if you need extra drag to hold the sash up. |