Old age or brain fade but I can't remember where I saw the possible mods to the prop shaft.

There was a further gaiter installed on one and a metal strap mod on the center bearings on another.

Just after the images really.

Can anyone help?

On Adams Bfg photos A redundant Gaiter filled with grease on the rear enter bearing and strengthening straps to the rubber bearings on the centre shaft.
Jacob kolza makes a bolt on protector frame. On eBay

Thanks! That’s the ones. Will look again.