I've used some Anchor mounts before, and all the holes were full of rubber from the manufacturing process. I had to use a bottoming tap and a knife to clean it all out.
The frame mounting brackets should be bolted on to the frame through slotted holes. If you loosen all the bolts, the mount brackets should be able to slide 1/2" or so forward and backward. Then you can start the bolts into the mounts. Make sure you don't tighten anything until all the bolts are started and threaded most of the way in.
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David
newbie #4153
