described herein are handle covers for use with one or more delivery catheters that may be used to deliver and / or remove an expandable cardiac implant . a handle cover may be formed from two interlocking pieces , and may include a control adapter that may be used to control release and / or attachment of an expandable implant . the control adapter may be configured to interact with an implant release control on the delivery catheter . the control adapter may also be lockable to prevent unintended activation of the implant release control . the handle cover may be reusable or disposable . in general , the implant control may be shaped so that hit may be held by a doctor , technician or other user , and may facilitate access to various components of the delivery catheter , including one or more ports .