My Barker started giving me fits on the down travel. I thought if it ever went bad it would be UP since that is when it is moving the weight. I thought it might need some more lubrication since it had never happened to me before.
I called Barker customer service - which is great, BTW - and the nice woman I talked to immediately told me it was the switch. She said the design is bad and they fail a lot. She also told me DO NOT open the head for lubrication as it would cause more problems than it solves and said the lube from the factory will last a lifetime. She put a new switch in the mail, I had it in three days and it was on the jack and working fine the next day.
Now if they would just re-design what they know is bad.......