A range of newly-fabricated pipe clamps, for large and small diameter vacuum pipes, steam heat pipe, and ATC conduit. Photo: John Whitcomb.

The driver's and fireman's cab seats and coal door in position. The driver's seat is higher by a few inches, to match the raised floor on the driver's side of the cab. The wooden seats are original but in poor condition, and will be replaced with new. There's an ongoing debate about whether the bunker front sheet should be green or black in 1947 GWR livery! Photo: John Whitcomb.

Doors in the rear spectacle plate of the cab which provide the fireman with access to the bunker coal space. Photo: John Whitcomb.

Two newly-fabricated 'swab boxes'. These will contain felt pads which surround the piston rods and supply vital lubrication. Photo: John Whitcomb.

The old foundation ring rivets have been removed and replaced with new. This photo shows the section at the bottom of the doorplate at the back (cab end) of the firebox. The white squares visible under some of the rivet heads are to ensure that the new rivet is central in the hole before rivetting. Photo: Peter Willoughby.

Old and new firebox stays - spot the difference! These small stays (585 of them in the case of 4150) separate the inner copper firebox from the outer steel firebox, and thus define the water space in between. Like the foundation ring rivets, the old stays have been removed by a process of having the heads ground off, then centre punched and drilled through, to enable the remains to be burned out and finally knocked through, and the holes to be reamed - a lengthy and laborious business! Photo: Peter Willoughby.

With all of the old stays removed, precise measurements have been taken of the new stay lengths required, and these lengths are marked on the outer firebox sheet, with yellow 'contour lines' to indicate groups of stays of equal length. Photo: Peter Willoughby.