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Taps must be form relieved ,ground thread .....el cheapo rolled thread ''gold plated'' taps take massivee force due to drag and break in the hole .......a GTD tap cuts freely without drag ...............as to dies ,even one piece of a Little Giant can be used to chase threads in a lathe...

TiN (gold colour) plating to hide inferior quality of taps ........difference between a Greenfield tap and modern rubbish taps is quite extraordinary ......and for dies I suggest you find a set of ''Little Giant'' dies ......recently discontinued from production ,but...

Acquire a broken tool free ,and try to parlay it into a new one........close relative of the ebay '' broken in transit'' scammer .

I just replacd four tiny screws in a camera .......sure could have used on of these

Go for 20 ton ...frame looks solid enough .

Surprised we havent seen a flood of tools for Ford V8 valve work ..... no valve clearance adjustment ,the valve has to be ground to length........valve guides in two pieces pulled out with valve and spring .......many unusual features in these marvellous engines scarcely believable today.

What happened to the original pump ?.......may be fixable

All the f/b vids of electricians grabbing bundles of money while leaving mess everywhere....true.

the curved blade type tools are for grinding engine valves with a curved slot in the head for grinding

A while ago ,I replaced the head gasket on my Thailand built Ford pickup ...........I was very pleasantly surprised to find all the exhaust studs and nuts were a rustproof material ,with no trace of corrosion or jamming when unscrewed .

One hand weed chipping hoe ......for a bush crop like cotton. or tobbacco

I once torqued a row of 3/8 unc bolts on a Caterpillar head to 100 ft lbs ,like the rest of the 1/2 bolts .......none of them broke or stripped ,and I redid them to 30 ft lbs ......of course they were Caterpillar bolts.

OP claims weld zone was cleaned in #1 ...dirty metal already suggested at #3 and denied .....I once had a big diesel engine sump welded by a ''top professional'' he ignored suggestions it was magnesium ,and welded with aluminium filler .....then claimed it was '''dirty metal''

Always put a water filter in the inlet .......sand and grit in the water wear out pumps

Air movement aka draughts are often the cause of T I G problems

The big advantage of gas engines vs diesel for gensets is running light or no load wont hurt a gas engine.

Some bolt makers supply in between sizes .....41 is a common size as its Budd wheel nut size ,but normally a special deep socket to take the square inner wheel nut on duals ......which is outdated tech with aluminium wheels

The old Dowidat ring spanners were all marked dual sizes ,thats 1960s

If the sockets are the wavy flank drive type ,they are a lot more tolerant of size difference ..........I recently bought a Force brand (Taiwan) set that are universal ,the set has all metric sizes ,no skips ,and inch from 3/8 to 11/16..........the old Metrinch sets were claimed to be both...

Incidentally ,for actual standard metric bolts ,you only need 19, 24 ,30 ,36 ,46 .........those are the standard bolt sizes .