家里的炉子是电的，用煤气，下图的这种炉子。老人第一次用，好像拧的太大力，把knob拧坏了 现在转不动了，怎么修理？如果找人来修的话一般要多少钱？ 谢谢

https://www.homedepot.com/p/KitchenAid-7-1-cu-ft-Slide-In-Electric-Range-with-Self-Cleaning-Convection-Oven-in-Stainless-Steel-KSEB900ESS/205902885#overlay