In my last secret pal box I had a pack of clover fork pins and they are brilliant. I sew very slowly at the intersection and once the seam has just got under the presser foot I withdraw the pin so that the needle won't touch it - the pin is still holding the seam edges - finish the intersection then speed up til the next one. My intersecting seams have improved greatly and I think the time saved in ripping is well worth being patient over these seams.