A word of caution about xeroxing plans...I have not yet found a copier that truly copies at a 1:1 (lifesize) scale without tweaking. Most produce a slightly undersized copy...about 98% of full size. Be sure the one you use produces a true lifesize image.

Most copiers have some way to set the copy ratio, and if yours does produce an undersize copy you can always set this ratio to something over 100% or 1:1 to get it to exactly match your plans.

If you just assume the copy will be made lifesize you might be unpleasantly surprised when you spend a bunch of time producing a replacement part that is too small to work.