On 15/08/2016 17:26, Maurice wrote:
On Wed, 03 Aug 2016 17:57:45 +0000, Cursitor Doom wrote:

This looks like a job for an impact driver.

Numerous applications of PlusGas and Impact Driver* did the trick!

The 'screws' are actually 1/4" dia 2" bolts with a circular slotted head.
Cleaned the gunge off, applied silicon spray to thread and bolthole and
replaced them.

Looks as though the bottom 1/2" of the thread screws into a flange
projecting
from the side of the chamber, but what I still need to check is whether
or
not the upper part of the thread engages with the lid itself after
unscrewung
from flange.
If it does, then perhaps there's a handle of some kind that could screw
into that (or try tying rope round bolt head, but head isn't all that
wide).

What might do the trick - if it exists - is a lifting spindle with spring
arms at the end, that could be passed down through the bolthole until it
comes out of the lower edge of the lid, at which point the spring arms
would
shoot out and provide lifting capability. (Once lid lifted out,
retract arms to retrieve spindle.)
But probably not enough clearance between lid and chamber flange for
arms
to operate.

Tomorrow will get a screw out and see if it still grips inside the lid on
the
way out. Too exhausted to do any more today...

In the meantime, anyone know of lifting gadgets for these situations,
please?

(* Draper kit; head setting for unscrew quite ambiguous. Trial and
error...)


Someone provided a link to 'J' keys on the Screwfix site a few days ago.
A couple of pairs of those - and two people to operate them -should do
the trick.
--
Cheers,
Roger
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