There are actually two bearings per side, if you look at the last of the first batch of pictures you can see the two side by side. I will get the part number, or size of the bearings to you all soon. They cost about $85 AUD for the four bearings...these are a sealed bearing. This mod is a worth while one especially with the new steering stem. The needle rollers will work well, but you need to use ground steel spindles, not stainless, as the stainless ones will end up with grooves from each roller needle.....I am using titanium spindles which I hope will handle the needle rollers. The side thrust will be taken up by making some simple bronze thrust washers like the Brampton ones. I will grease them on final assembly. I do not think the needle bearing conversion would be so necessary on a road bike, the set up to machine out the bores of the links is time consuming and expensive, but the bores of the eccentric eyes is not hard, and only needed honing out a few thou. The problem I'm sure you would all understand is doing a "One Off" job like this is an issue, but if several were done, the cost comes down. With the lower link assembled to the stem, the link rotates up and down beautifully with no friction at all. The next batch of photos, shows the engine and crank before final assembly. The crank was built entirely of new parts, and uses RTV flywheels, stepped main shafts, heavy press fit caged big end, and new Argo connecting rods, the latter are made here in Australia, and use the same beam section as original Vincent rods.....I prefer this to the heavier Carrillo rods, and these are the rods that Terry Prince is using in his cranks now. The visible counter weights on the wheels caused me to have to remove some material from the drive side webbing visible in the second photo. Those with a keen eye will note the 5 speed gear cluster sitting on the bench, this was one of the ones Terry did years ago. Reg told me I was mad using 5 gears instead of 4, but I think the box will be smoother and give a better choice of gearing on the corners......Heck I can always put the 4 back if I don't like it. If you are wondering what the small damage is inside the case, this engine had tossed a rod earlier in its life on the right side. This has required a fair amount of repair work to true it all up......Oh and by the way....the total run out on the mainshafts is 0.0003 That's right three tenths of a thou, so it should be nice and smooth, Cheers for now........Greg.