Try lubricating the pressure foot shaft where it slides up and down (2 Places). To do this you need to remove the left side cover - the flat black screw in the slot under the left side of the carrying handle. Back the screw off slightly and pull off the left side plate. This should allow you to oil the shaft. I use Mobile 1 Synthetic 0W-20 oil. I find it works extremely well, as good or better than sewing machine oil. The problem is caused by the original grease they used when these machines were manufactured. The grease hardens over time (especially if the machine hasn't been used for awhile) and causes the shaft to stick. You might need to use a little penetrating oil initially, especially if the shaft is really stuck. This is a fine machine - good luck... LS.
There is a problem with the spring in the shaft you will need a repair service
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