Just seen this rarity on fleabay .Never knew they even existed ! https://www.ebay.co.uk/itm/18594152...rentrq:ce4e10d01880a7691c8f008dfffde692|iid:1
They crack at the rear hinge fitting, there's no way to mend them I reckon. That could be the "bit of separation" in the description?
So do the metal ones.. I'm almost tempted as something to fill the hole while I restore the current door with the bus outside.. I bet some carbon fibre and epoxy could fix it more permanently too.
There's no option to add any thickness where they crack. Somebody decades ago at TE used to have one with "the crack" and nobody could see a way of fixing it. I believe they got themselves a steel one eventually. A bit weird all round because at the time these were made it was not hard to find a decent steel one anyway. Now there would be a market but they're not being made. I wonder where they originated? Maybe VW made them for some special purpose, they look pretty fiddly to make from GRP, I can't figure why anyone would do it?
The one I had was a perfect replica tbh. Wouldn’t tell the difference till you tapped on it or picked it up!! Just wasn’t right! Bugger to close tbh. Possibly not enough mass or flexing . We just gave up in the end!
Not The Bearing Runners, then? On the same sort of note, I was driving to Bridgewater one day and saw an earlier bay, in a front garden, with twin opening doors, like a splitty.
I think the problem would be that the whole thing is not stiff enough made from glass fibre and polyester resin by somebody who just took a mould off an original part. If you designed one properly with some inner fabricated stiffeners and used some carbon fibre in the right place it would be stiffer, and if you added a metal plate to hold the rear hinge which really gets hammered, it might stay together. It certainly wouldn't be a cheap home made technology part then.
I think they did all that, you can't bolt stuff to holes tapped in grp and expect it to last more than a few minutes..