Just remember before you start Rondog that the No5 is particularly sensitive to the fit of the fore-end. Even more so than the No4 for various reasons... So if you DO decide to remove the fore-end, make sure that contrary to what might seem obvious, you REMOVE THE FORE-END BY TAPPING THE REAR SIDES EVENLY DOWNWARDS WITH A BLOCK OF WOOD to loosen the rear first. This will break the taper fit between the fore-end, the draws and the butt socket then allow it to drop down parallel.
Pull it down at the muzzle first and you WILL destroy the draws in the fore-end. And without a set of good draws in a No5, then any hope of accuracy, such as it is, will disappear!