Handbrake
There were three versions of the 3.8 handbrake mechanism:
C17450/C17451 - up to #850089/875331/860003/885014
C19904/C19905 - up to #850550/875566/860663/886262
C19830/C19831 - up to end of 3.8 production
The J30 August 1961 Spare Parts Catalogue shows the mechanism fitted to the very first cars. It is a relatively simple affair with a domed head adjuster bolt and hexagonal socket requiring a special tool. :
The J30 June 1963 SPC shows the later more complex mechanism with a slotted screw:
Handbrake Adjusting Tool
The early cars had an adjusting screw with a domed head and hexagonal slot so a "Special Wrench for handbrake adjustment" was provided. The August 1961 shows the Special Wrench as #C18636 (4" x 7/8" x 3/16") but the June 1963 J30 SPC does not list it. SPB K.36 lists the deletion. The JCNA concours Judging Guide acknowledges this and the Special Wrench presence or absence in cars above #850089/875331/860003/885014 is ignored.
Later cars from #850090/875332/860004/885015 were fitted with self adjusting brakes so had no need for the Special Wrench.
Battery terminal removal tool
Some tool kits included an 'L' shaped screwdriver #C10154 in place of the Allen key and used for removing the battery post slotted screws - necessary because the right hand post is under the heater box with the battery installed correctly (terminals to the rear):
