I have been using the train of thought that each bar tack is rated to 200#'s, my suspension is rated to 1000# so I sew 5 rows evenly spaced (about a 1/2"). Hasn't failed yet!
Formerly known as "Cranky Bear"....
"yesterday is history, tomorrow is a mystery, but today is a gift---thats why its called a present" - Master Oogway
It's always best if your an early riser!
I like hiking as it's like exercise!