Spare TG582n modem\router as a repeater?

I have two of these Technicolor TG582n units. Could I set one up to act as a repeater?

I have a workshop computer in an 50m=distant outlying tin shed. It can almost pick up the house TG582n signal, but not quite. A laptop outside the shed picks up the signal OK.

So I wondered if I could mount the spare modem on the outside of the shed, in a wooden or plastic box, and configure it as a repeater?

I'd cable it into the shed from the outside wall - about a 2m run to the computer.

Possible?