Peter,
Your original posting inferred that the silentbloc was faulty because the inner was not concentric with the outer, you now seem to be saying that the rubber might just be deformed by - say - poor storage. If you can push the pivot bolt through the 2 bushes and the ends of the bushes look to be concentric, leave well enough alone. One of the ends would need to be noticeably off centre for it to seriously affect the handling. About 12 years ago, I converted a front swinging arm to bronze bushes and remember the OD being something odd - like 1 1/32" or 1 3/32" (bear in mind that the bike was built in 1955, so the dimensions then would have been imperial, not metric).
Regarding the kickstart problem - if both the engine and gearbox can be turned as separate units, the problem probably lies with the mating up of the 2 units. Try undoing the front engine mount, then undo each of the bellhousing allen screws one turn to see if that improves matters - if it does, there is probably something amiss in the bellhousing (maybe an over thick washer on the gearbox main shaft, or the crankshaft split pin only bent lazily over the end of the shaft and bearing on the gearbox mainshaft) that is creating an end load on the shafts. If the kick start wont turn, don't force it! The weak point in the Dragonfly gearbox is the kickstart auxiliary shaft. The round cover at the back of the gearbox has a slot in it for the auxiliary shaft locating pin - this breaks out, also causing damage to the main casing where it supports the other end of the shaft. I prefer to have the slot welded up, and remove the locating pin - after all, the shaft will only turn while the kickstart is being operated - during normal running, the kickstart is stationary!
Regards,
Eddie.