I've been planning to test the Fisher with 24v, and in fact received a suitable power supply in the post today, so I'll let you know how it goes.
We do have bed springs. I'll get them listed on the site over the next couple of days.
You may need a power supply which can provide more current than the one you linked to.
Cartridge heater resistance is 6 Ohms and the bed is 3 Ohms. So at 24v, the hot end will draw 4A and the bed 8A. Your power supply therefore needs to be able to supply at least 12A at 24v, or 288W power. These figures cater for powering all the heaters at full power, which is not necessary except to speed up the warmup time from cold. During printing, the heaters operate at a fraction of their maximum power.
The sd card I was using became corrupted and I reformatted to remove issues. After re-loading the Firmware and other folders onto the card, amending the config g file to ensure correct height of the nozzle from the heatbed and other settings I re-inserted the sd card into the fisher. Unfortunately it no longer picks up the heatbed on the DWC Panel. I added the command M305 P2 R4700 to thermistor category under the previous M305 command for the nozzle but the heatbed is still not showing on the DWC Panel. Thanks in anticipation.