Wanted for my 403 restoration (1402 - reg NXT 655)

[peterg]

I used very thin ply wood, cut it into strips, glued, wrapped and clamped it around the finishing strip until it filled the void. Rather fiddly for an amateur cutting it free style in the back garden but should be fairly easy for someone better prepared.

I have the remains (90%!) of the sheet in London if you need it/ some.