Partner wants out of LLC but we disagree on buyout price

Need help here. My business partner (50/50 LLC, consulting firm) wants to leave the business. We both agree he should exit, but we're miles apart on valuation.

Our operating agreement says buyout price should be "fair market value as determined by the remaining members" - which seems like it gives me the power to set the price? But he's saying that's not enforceable and wants to hire an appraiser.

Can he force an independent valuation? What's standard for service businesses like this?

PSA: if you're a single-member LLC, your asset protection is only as good as your compliance. Commingling personal and business funds can pierce the corporate veil faster than anything else.