I got tired of chasing my foot control around the rug while sewing. I have tried mouse mads and other things to no avail. I had some rubber under carpet stuff that we use under some oriental carpets to keep them from slipping. It is thin and rubbery and works well for the carpets so I thought it might be useful. I cut an appropriately sized piece and used some 3M super 77spray adhesive on it and then placed it on the bottom of the foot control. Bingo, no more slipping and sliding and playing footsie with the control. I sewed all day and that control never moved an inch. It in no way affects the operation of the control as it is attached to the outside bottom and does nothing but provide resistance. I had used the machines on bare floors for years and never had any problems until I carpeted the sewing room to try to make it warmer. I applied the same stuff to all the foot controls and now have slip free sewing on all the machines. I hope this will be of use to anybody who has that same trouble as I did. You might be able to duplicate the same effect with rubber shelf liner, but what I used should be available from any carpet store that sells area rugs.
John Taylor