Many thanks for all the replies. Well, I was doing almost everything
right.....I've always managed before by sliding the boot over the cylinder,
locating the seal into the piston and easing(!??**?) the piston inwards and
finally locating the boot on the piston.
Regarding the "almost everything", I had not noticed that the seals within
the pistons, as supplied with the new kit, were simply too big. Luckily I
had a pile of old ones and was able to go back to the original smaller size.
So, check the seals' size and save yourself some trouble.
I used LM grease as a lubricant which, hopefully will be flushed out in the
bleeding/fluid renewal process.
A footnote on the inner seals' profile. I remembered them as being tapered
and did find a reference to this in the Haynes manual:
"9) To reassemble, first fit the internal seal, previously wetted with
Castrol Girling Brake Fluid, into the groove in the cylinder bore with the
scraping edge (smaller diameter) innermost".
Simon
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