On 03/01/2016 9:44 AM, Don Y wrote:
....

It doesn't matter whether I'm looking to replace just the slab
(reusing existing frame) *or* replacing the entire frame (with
a prehung unit) -- if the RO is sized too narrow!

The remedy available to me is to replace/revise the buck; or,
fabricate a thinner jamb (assuming that to be a cheaper solution
than a custom 35.5" metal door).

I'm not keen on letting this turn into another long-winded
back-and-forth where we play 20 questions and roam around
visiting all sorts of different issues that MAY or MAY NOT
be pertinent.

"A stock 36 inches door is 36 inches -- whether a slab or
(effectively) when prepackaged in a prehung jamb"

That's all I need to know to sort out what I have to do...

Excepting it already has in large part owing to your reluctance to
outline the actual objective and specifics of the condition.

We've already established that nominal 36" doors aren't necessarily
either 36" _or_ 35.5" and that you can undoubtedly find either. That
still leaves open all the other dimensions and details that are just as
important as far as what would have to be done to make a swap.

I'd think the likelihood the RO is too narrow pretty low but it is
possible, yes. Have you done enough exploratory work to know what the
RO dimensions actually are? You may be making mountains from molehills
and the simplest solution is to simply rip out the old and put in a new
prehung stock unit.

--