My dumbbell

This is an old metal dumbbell. Weight about 30 pounds. I'm constantly gaining weight. To do this, I buy metal rings at the market. I need to buy another biggest ring. Then the dumbbell will be completely assembled. But so far I have not been able to find the largest ring.

When I train I lift about 7 tons per workout. That's not a lot. But I do exercises every day. I have 5 exercises. I repeat each of them three times with each hand.