Yes, and they have a mechanism inside to hold the door closed that wears out. OP will be happy swapping them out and it is preferred over something like a magnet to hold the door closed.

A, um, friend was doing some tractor work near their shop (separate meter) and accidently hit the meter with the bucket. Popped it right out :O He plugged it back in and replaced the ring and the seal. A couple years later the utility company 'upgraded' the meter, replacing the old and didn't notice. Whew!

Sorry, but all those saying "hire an electrician" are either A- electricians that want to get paid or B - too scared of the "electrical magic" to take on something a little technical. 20 years ago I wired my entire home. I worked with city and L&I, followed a code book, and passed my inspection.

No disrespect to electricians. There are a lot of things in electrician world that are complicated and require specialized knowledge and experience. When it comes to a household panel swap, or a simple outlet replacement, 99% of the job is manual labor.

So, if you can do it legally (permits/inspections) and safely (disconnect power at meter) then go for it and don't let the A's or B's deter you.

Having said that, there is one additional thing to consider. Since you are replacing a panel, you are likely going to have to bring some items up to current code and not just replace new like the old. You will want to make sure you know what all is involved in said upgrade before starting.

As the saying goes... Cheap, Easy, Good. You can have 2, pick 2.

Can't really tell how the legs attach to the desk. Is there a way you could get a piece of plywood, actual plywood not particle board or OSB, and sandwich it on the other side of the particle boars screwing through plywood, through particle board, and into the center of the leg? This plus adhesive on all contact points may be sufficient. Obviously you would want to paint any exposed wood.