ok lets recap
say you have to move the fender in 6 mm to get the gap your looking for.
remove the fender and hit the apron in about 8 to 10 mm . this way you know its in at least as far as you need to go.
place the block of oak as it is in the pic. and hit it with a bfh.
now you have moved the apron in just a little more then you needed it install the femder and screw in the upper fender bolts only.
lay the block of wood across at least over two of the bolts making sure the force load when you hit the apron back out your hitting where the bolts are to move the apron and fender all at the same time.
with a BFH it should only take a good hit or two to move them both out.
don't force it use a bigger hammer
