I am sure a process I used is not good engineering but it worked for me.I have a T8 that I use with a Japanese stone.
I have used a T4 (Its a 200 mm blue machine maybe its a Supergrind 1200 ) for 20 years at my work at a school .When I retired I got the T8 and started a sharpening service.The original stone on my T8 reduced to about 200 and I priced a replacement.Instead I got a second hand supergrind 1200 and adapted the bigger stone to fit.
I centred a dowel insert into the removed stone then used an old 25mm spade bit in a solid bench drill press to counter drill the stone
10mm.Not much left of the spade bit but they are disposable This allowed the 250mmx50 stone to fit on the shaft of the small machine (as it has a shaft for a 200 x 40mm stone)So I have been able to use the worn 250 on my smaller machine.I use a chopped 2 litre icecream container as a water trough..I have a "rough "chinese water stone machine(about 60 grit with a high speed stone one end and a reduction box water trough on the other) for reshaping and repair ,then my little Tormek 200/1000 grit then 4000 Jap stone on the T8.This way I get to use 4 levels of grinding /sharpening without the drama of changing stones.I rate Tormek so highly I picked up an almost new T7 as a back up "in case" my little machine dies.I also get to save the Jap stone for knives mostly.By using the SG stones first there is not much work needed to finish on the Jap stone.
I have used a T4 (Its a 200 mm blue machine maybe its a Supergrind 1200 ) for 20 years at my work at a school .When I retired I got the T8 and started a sharpening service.The original stone on my T8 reduced to about 200 and I priced a replacement.Instead I got a second hand supergrind 1200 and adapted the bigger stone to fit.
I centred a dowel insert into the removed stone then used an old 25mm spade bit in a solid bench drill press to counter drill the stone
10mm.Not much left of the spade bit but they are disposable This allowed the 250mmx50 stone to fit on the shaft of the small machine (as it has a shaft for a 200 x 40mm stone)So I have been able to use the worn 250 on my smaller machine.I use a chopped 2 litre icecream container as a water trough..I have a "rough "chinese water stone machine(about 60 grit with a high speed stone one end and a reduction box water trough on the other) for reshaping and repair ,then my little Tormek 200/1000 grit then 4000 Jap stone on the T8.This way I get to use 4 levels of grinding /sharpening without the drama of changing stones.I rate Tormek so highly I picked up an almost new T7 as a back up "in case" my little machine dies.I also get to save the Jap stone for knives mostly.By using the SG stones first there is not much work needed to finish on the Jap stone.