Hi Johnny,
I'd ordered a brand new 200 mm 3 Jaw Griptru @ £526 from Buck and Hickman last December, April this year with not even a likelihood of a delivery date, I got a refund.
Asked about at our local Autojumble (Normous Newark), and a tool stallholder said he had this 250 mm for £125, so I jumped at it, even though it only had the inside jaws.
No 6 jaw has the first scroll guide broken off, so I went for using just 3, apart from the likely ingress of swarf in the empty guide slots, the improved visibility far outweighs any perceived advantage of the 6 jaws.
On re-assembly as per advice given by a technician at Pratt, the 6 countersunk screws holding the body together, should only be hand tightened, I'm presuming with say a 'Tee' handled key.
I'm experiencing a slight juddering, (not previously noticed with my original 200 mm 3 jaw), whilst parting of at high speed, on materials such as En8M & En24T, so I'm wondering if the screws are tight enough, I'm thinking that some sort of torque setting would need to be applied, to give consistent sliding pressure to the movable body parts.
What size are you after? and what price range are you looking to pay, all the new ones I've Googled for, are as dear as a decent sized secondhand lathe, Jubilee Tools in Derby are listing an incomplete 200 mm 6 jaw Griptru for £475, I offered them £350 inc tax, but they said it would have to be with the tax, so I left it, I believe they still have it.
By incomplete I mean only the inside jaws and only 2 adjusting screws.
Sorry if I've waffled on, but can't seem to sleep since being made redundant a week and half ago....