Do not buy ISO's from Norvil, they are built to a price and use an off the shelf tube which has too large an ID, the bearded one says they are OK but why risk it to line his pockets. Buy from Mick Hemmings, RGM or Andover Norton, if you ring them they can sort out the best version for you, best to go for vernier adjusters for pre-MK3 as for the front at least MK3 will not fit without some work.
Another vote for the Mick Hemmings iso adjusters. Concerning the rubbers: make sure you buy the soft rubbers, many aftermaket iso rubbers are harder than the originals, and will transmit more vibration than the originals. Don't ask me how I know..
Peter. 1974 Commando 850 1972 Trident T150T 1961 Goldie DBD34 1969 Benelli 250 sport special
New from Andover Norton is a Vernier adjustable front Isolastic engine mount kit for all Pre-Mk3 Commandos, which is any Commando before 1975 which used shim Isolastic adjustment.
The new kit has modified width abutment and adjuster end parts to suit the unequal length front engine mount tube on pre-1975 Commandos, and gives the ease of adjustment which is only normally found on the Mk3. This kit makes the setting and adjusting of the Isolastic clearances a much faster job.
The silver coloured items are the new tube caps (these replace 060684). The bronze coloured items are the PTFE washers (replace 060578).
The clip, far left, fits over the movable adjuster to prevent crud blocking the adjuster rod holes.
Here's the instructions for the RGM vernier conversion kit which is basically similar to the AN kit as far as assembly and set up is concerned, so might give you an idea of how it fits together and how to adjust it, however it's not exactly rocket science.
I do recommend that you check the Iso. clearance with a feeler gauge after the assembly has been fully tightened, and I prefer not to rely on the instruction to: "back off the adjuster by 1.5 turns". Due to the necessary running clearance between the threaded parts of the adjuster some Iso. clearance can be lost when the bolt (and nut) is tightened.
Gotta say I have been given one for free and would not use it. Maybe the newest and softest kits and then only on the heavier MKIII. In my test chart the brown kit is probably what you currently get. Notice the blue curve originally supplied on pre MKIII, which is about half the rate of the brown. And then people are surprised that their preMKIII vibrate more than before. But for a lot of people marketing seems to trump engineering and science. The Mick Hemmings adjuster (designed by an American) is IMO an acceptable/worthwile mod for reasons of adjustability.
dynodave BSA 3 1961-1963 Ducati 3 1992-2002 Norton many 1951-1975 87 Serv-Equip 100HP MC brake dynamometer,