Ton Kooiman Etude 3 thumb rest installation on clarinet

When I started practice clarinet for longer period at time, I found that original small metall thumb rest made practicing almost impossible becauce of PAIN - and it got WORSE all the time I played. I decided find some solution for this problem and after google search I read about Ton Kooiman productions. Modell Etude 3 was about 24 € and I thought it’s small price if I can get solution for my problem. It really helped/helps me to play hours without any pain and it also support the clarinet more stable while playing. I just bought old Hammerschmidt Nr 15a clarinet from and I want use it with Etude 3 thumb rest. I show you how easy it’s install this equipment on clarinet. With Schreiber clarinet I have used originat screw places (2 screw) but this clarinet need 3 holes to trill for screws I used one original one for fastening. I used little bit longer and finer/thinner screws for fastening than was in package - for I use neck stripe with etude 3 (I have made modification f