I was using OEM Product's Brake master cylinder, but there was not any problem.
However, the situation has changed due to my illness.
Right The leg did not move well and the delicate Rear brake control could not be done.
So I came up with Thumb braking system that Doohan used.
We also created a design drawing of construction by yourself.
Thumb braking system Body asked the acquaintance processing company to create it, but because processing of Master cylinder was difficult, I bought this product that can be input from another line.
Installation support was also designed, and the same vendor made it for me.
My illness is cerebral infarction.
Fortunately the aftereffects were light.
I think that there are some people who give up on riding motorcycles for similar reasons.
Please do not give up!
I will manage it somehow..
Looks like you access from European region.
Would you shop at webike.eu.com?

