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not familar with the Frabill BUT, if you drill the holes smaller than the bolts....screw them into the tub...they will hold themselves in place. I did my Otter Mag. Lodge in under 30 minutes doing it this way.1- if you have 2 drills rig one with drill bit a little smaller than the bolt, the other with correct screw bit2- drill first hole for hyfax, bolt and nut this one3- drill next hole, screw bolt in...drill second hole, screw bolt in. put all the bolts in then step around tub and put nuts on.Repeat #2 and #3 for the rest of the runnersGood luck!!! Great tip , wish I would have done that .....
Here's what I did with mine.Didn't like the idea of drilling holes in the bottom of my sled. Didn't like the price of the plastic stuff either. There's about $5 in my runners.RG