Might be a liability thing - Magura don't want you doing this in case it's not done correctly and the brakes fail, would be my guess anyway - given that you got a very "we received legal action" response from the company you contacted which used to make the tools.
Might be a liability thing - Magura don't want you doing this in case it's not done correctly and the brakes fail, would be my guess anyway - given that you got a very "we received legal action" response from the company you contacted which used to make the tools.