Terkaa suggests boring & honing the lockheed slave cylinder out to 24mm & then using an "Isuzu Bellett PBR 4515 clutch seal". Unfortunatly they stopped making the Bellett in 1975 & nearly all of them were sent to Austrailia ! So, no new seals available here in UK/Europe.
Fortunatly the hydraulics people , Derek Lane & Co, Whitestone, Exeter 01392 811466 sell a similar sized seal. It is part number SU24-14-7DI-P & costs £4.87 +p/p. The outer diameter is slightly larger than the original & will fit a bore up to 24mm.
If your bore is really rusty, you can ream & hone it out to 25mm but the larger seal that they sell for this has an internal diameter of 15mm (which is larger than the original & so you will need to make up a new "piston" on your (friends) lathe. The piston will be the same length & overall shape, but have an outside diameter of 24.8mm, a 15mm diameter recess for the new seal. The recess should be 8.3mm wide.) I do not have the part number for this larger seal (I forgot to ask. nor, sadly, do i have a lath (or friend)).
I have covered about 4000 miles now & have not used/lost a drop of clutch fluid since the HONING.
(Master brake cylinder next !).
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