If it were me, I'd replace the wall mount with a different brand(cheaper too).
I recently installed a few 2-piece TV wall mounts.
(click here). This 2 piece wall mount has a "V" shaped wedge. One part slides into the other.
I put one in the camper, one in my shop kitchen and the other under the patio cover. Now, when I'm not using the tv in the camper, I can put it into the kitchen or place it under the patio, just by disconnecting the power and cable cord, then slide it UP to remove it. Slide it DOWN onto one of the the other half of the mount.
Price?
$12.99 each.................