- For all perinet valve instruments - Improves response and accuracy - Makes the sound more centred - Screw the knurled screw completely out of the TSE, put the threaded part from the back against the valve sleeve and screw both parts together with the help of the knurled screw so that the TSE rests against both valve sleeves - Silver-plated - Made in Bavaria / Germany EUR 58.00 - See more - Buy online