Wilson Hard Anodized Case Holder Clamp This clamp offers an alternative to holding the case holder down by hand while trimming. Simply set the case holder on the trimmer rails, then swing the clamp over the top to secure it in place. An adjustment located on the top of the clamp allows you to increase or decrease pressure as needed. Part # CT-SSCLMP has been replaced with CTP-ACLMP. This clamp may not be compatible with some Q-Type case holders.