Made a first attempt at using SCH 40 for a mast. Cost $9.00 and comes in 10 foot length. The good news is the mast cap fits nicely, not so good new is it's really bendy without something inside to stiffen it up. It's back to the home improvement store to scout out Componet X to insert in the tube. I could do SCH 80 but SCH 40 is already heavy. Gotta find something $25 dollars or less or the project does not make sense.