After reading this thread:
http://www.scubaboard.com/forums/apeks/395490-atx40-normal.html
I decided to try and find another budget alternative to upgrade my TX40. In the UK Apeks dealers wanted £30 + p&p
I came across this website:
SCUBA products A/X/TX40 to A/X/TX50 conversion
who only wanted £9.99 incl p&p
I duly ordered one and it arrived within 2 days
Here it is sitting on my TX 40
Also on the site it gives instructions for fitting:
Instructions for installation of second stage adjustment knob
http://www.scubaboard.com/forums/apeks/395490-atx40-normal.html
I decided to try and find another budget alternative to upgrade my TX40. In the UK Apeks dealers wanted £30 + p&p
I came across this website:
SCUBA products A/X/TX40 to A/X/TX50 conversion
who only wanted £9.99 incl p&p
I duly ordered one and it arrived within 2 days
Here it is sitting on my TX 40
Also on the site it gives instructions for fitting:
Instructions for installation of second stage adjustment knob