OK got it. how much do you need to remove for clearance?When inserting gearbox with righthand engine plate in place, it hits frame about 3/8 before it meets the engine plate.
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Springs - There are 3 on the rear brake plate. The shoes have two as normal, one at the cam and one at the pivot. The third is fitted behind the brake operating arm BUT often this one is left off. The brake shoe springs are heavy gauge and not like those you would find on a road bike. Andy Molnar can supply, its probably best to replace anyway.Hoping that jalsteve will have time to spread his wisdom on rear hub parts, I contnued with gearbox installation. Spent yesterday evening filing LH engine plate to accomodate that fat and heavy TTI-box.
Now the gearbox and LH engine plate is in place. Shortened the bottom gearbox stud 4mm, so now it's possible to take gearbox in and out without raising and/or lowering engine. Norton should have done that mod themselves. As a final touch I drilled a 2mm hole in the gearbox and a washer with a tab also drilled 2 mm. So now I can lockwire engine and gearbox drain plugs.
Only tricky part in gearbox assembly is the top rear engine bolt. To get washer and nut in place below the magneto and behind magneto chain covers is a bit problematic.
Washer was put in place with help of a small magnet. For the nut a thin plastic glove with nut inside (on left hand thumb) worked surpricingly well. Blurry on picture.
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Yep that's an original clutch with a modified centre. Usually the extra slots in the hub were done as the old slots get badly notched. The 1/4 x 1/4 50 roller conversion is a common mod. The chain wheel is standard Manx, the copper plate was applied to protect the basket during the hardening process, road clutches don't get this treatment. All Manx clutches have square key bolts and the springs should be square section wire.Sad to say, have been busy with other things. Not much done to the Manx. My neighbour calls it the mailorder bike. Just because all delivery vans and lorries that come with small and big parcels.
Next week nothing will be done to it. Then I'll do the rear wheel, get primary drive in line and try to fix a leak in left fork leg.
The original (?) clutch is a mysterious thing to me.
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Notice the spring screws with 1/4" square holes. Basket and pressure plate lightened. No steel cage but filled with a lot of rollers. 6 Allen screws. Friction plates and centre different size of "splines" than other Nortons. Steel plates probably usual size. Sadly it had a hard life, centre much worn. Will use an Andover clutch.
Some small things done. Replaced rubber mount for float bowl and made a gear lever.