I reupholsterded a bar stool and now cant get the screws to go back into the bottom..I dont think the screws are stripped, i think the screws arnt long enough to go back into the bottom of the cushion due to possibly thicker material i used..i cant use longer screws either cuz then if ya sit on them they would tear into the top of the cushion and my rear end.. OUCH!! Any suggestions would be greatly appreciated!! Thx in advance!!