I have a cast iron Waterford STanley wood cookstove. It has been a joy to use, but it turns out that the firebox liners are made of cast iron backed by rockwool. After my first year of heavy use (I have had the stove for about 5 yrs.), the firebox liners are warped and need to be replaced. Aside from the problem that I can't get them out because of the warping, they are very expensive. It would cost about $500 to replace the sides and back. I would like to replace them with firebrick. Has anyone tried this? Do they stay in place? I am assuming that the 1 1/4" thick firebricks would be adequate, though I dont' know what is the temperature in the firebox during a hot fire which makes the flue thermometer read 400 deg. F prior to damping. Does anyone have any thoughts about this? Thanks from the frontier of NW MT. I should add that the l. side firebox liner, which faces the outside of the stove (rather than the oven) has several holes drilled in it near the top. I don't know the function of these holes.