I hadn’t tried it before but this is how I repaired the fount on this Austramax 3/300 As you can see the pump has been pushed in and dented the fount badly. First I threaded the end of a rod and centred it to help manipulate the pump tube. Then unsoldered and removed the pump. To be able to apply the necessary force without damaging the font I screwed the font to the bench using a piece of plywood. The ply sits on lip of the fonts skirt leaving a gap between the ply and the bench. There were 2 main problems: 1. Getting something inside the font that was curved and large enough to pull the dent out. 2. Applying enough pressure to pull the dent out. Looking around the shed at my raw materials (crap) I came up with these devices. First the round one was a firm plastic foot from a piece of electrical equipment. It could be bent and fitted through the pump hole. The other was a piece of aluminium bent into a curve. Both were fitted with 6mm (¼’) bolts. 18’ of angle iron pivoting on the edge of the bench gave the necessary controlled force required. The round tool pulled most of the dent out but left a ring near the outer major crease. The aluminium tool was used to smooth out the creases. Not perfect but a lot better than it was. Re tinned the soldered surfaces then positioned the pieces ready for assembling. Soldered and cleaned up. I’m happy with the result and hope this gives others ideas.