if you thread a branch through a hole that is slightly larger
than the
diameter of the branch..and there is no "tight" fit will the
graft still
eventually take?

_Probably_ not.

or will the tree just grow a sort of tunnel around it ...
like a tree does with a power line or fence...sine the time for
the cambium
(s) to come in contact will be greater and callouses may form.

It is possible that this would happen, but in that event the
swollen callus formed on both the branch and the trunk would be
so ugly that no one would want it.

It's always best to do things right. If you have already drilled
this too-big hole, let it heal (you can even inject some wood
filler into the heart, if you want -- or not) and drill another
one nearby -- one that is the right size.

Jim Lewis - - Tallahassee, FL - Our life is
frittered away by detail . . . . Simplify! Simplify. -- Henry
David Thoreau - Walden

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