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Not sure what's old-school about it, it's a useful technique for bending any pipe etc when you haven't got a bender/former to hand.

Just the right sized hole through a piece of wood, if you have a round rasp - take the bottom edge off the hole approximating the radius of the bend, it helps.

I have used it for the odd time when we couldn't be bothered getting the bender out - especially for the odd plumbing job (although you need an internal spring for copper pipe)
 
Not sure what's old-school about it, it's a useful technique for bending any pipe etc when you haven't got a bender/former to hand.

Just the right sized hole through a piece of wood, if you have a round rasp - take the bottom edge off the hole approximating the radius of the bend, it helps.

I have used it for the odd time when we couldn't be bothered getting the bender out - especially for the odd plumbing job (although you need an internal spring for copper pipe)
I used an EXTERNAL BENDING SPRING for Refrigeration pipework
 
Straight hole same size as conduit, to be bent

Away you go
I was taught at college that the hole in the wood had to be 1½ to 2 times larger than the conduit you were bending to avoid it jamming in the block, used that method loads of times with no problems
 
I used to have one in the 70's for 20mm. Drill the 4x2 ( 6" from the top ) a straight 25mm hole. With a 20mm tube heated with a blow torch, manipulate up and down to make formed soft edges. Ideal for awkward bends and also dressing many tubes in parallel.
 
I used a wooden block once years ago, you still need a vice for threading and cutting, might as well get a hilmor conduit bender.
Remember that old vice had a wooden foot plate years old ha ha.
 
I also use one of the above sometimes.
I've got a 20mm and 25mm of a similar design. They are a handy bit of kit for the odd bit of conduit on a job
 
I used a wooden block once years ago, you still need a vice for threading and cutting, might as well get a hilmor conduit bender.
Remember that old vice had a wooden foot plate years old ha ha.

Yup, mine is a hilmor - gm32/35 or something, only have formers up to 25mm though.
 
Do they work for our 20mm? Been thinking of one of them in lieu of a bender

US conduit is thinner than UK - they have a wall thickness circ 1-1.2mm uk class 4 is 1.5mm

3/4" US conduit is approx 25mm UK conduit in diameter I think
 

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