Take some white shoe polish and put a small dab on the edge of the rim and tire, if it moves install the screws
![wrench wrench](/ubbthreads/images/graemlins/custom/wrench.gif)
I think I used #10x3/4 inch long course threaded sheet metal type screws with a 6 sided hex head to make it easier to install and remove
![scope scope](/ubbthreads/images/graemlins/custom/scope.gif)
I had used regular head screws in the past, Phillips and standard straight cut in the past until I switched
I inflate the tires up above 25 Lb. and use a small drill bit a little smaller than the body of the screw to drill the rims and a short way,(3/5 to max of 5/8 inch) into the tire bead to allow the screws a good start into the beads
IHTHs