Made a rookie mistake. I was so excited to see & purchase 1/2 gallon jars. Only as I was cutting up potatoes & carrots to can after work today, that I realize the presto will not fit them. Some day I will be able to get a big girl cannier..Also I did not know I would need engineer degree to put straps on my long barrels OR put one together from the box. Never had a new gun before from box. 😳 What if I put barrel on wrong! I may have to reach out.