I remember reading a while ago that stubborn Ransomes Ajax cylinder bearings could be removed using a pair of lorry tyre levers. I do not have any of those so I thought of another way.
I purchased 50 M20 Square Taper Washers, being the minimum quantity that I could buy. They have a 14 degree taper and can be found here https://www.zoro.co.uk/shop/fasteners/square-washers/m20-square-taper-wa...
I used a hacksaw to saw into the central hole from the thin end of three of them and used them as packers and wedges to release the bearing assembly from the cylinder shaft. The process is illustrated below, but please consider it is difficult to hold the first two in place while also holding a camera and photographing the process.
The fear I had of using large tyre levers is that I would need to hold the cylinder vertically to resist the reactive forces from the levers. My way presents no safety threat as the cylinder can simply rest on a bench.
Step 1 Sit the cylinder on a bench - in my case I used a portable folding bench and located the cylinder in the open jaws so that it did not roll
Step 2 Gather your tools - one small hammer plus three tapered washers
Step 3 Position two of the washers laterally between the cylinder blade holder and the bearing assembly
Step 4 Support the two washers with suffiient overlap to leave a gap for the third tapered washer
Step 5 Insert the third tapered washer at 90 degrees to the first two and tap the third washer delicately with the hammer
Step 6 When the third washer has moved as far as you can without jamming it, release the three tapered washers
Step 7 Repeat steps 3 to 6 and the bearing should release as it is driven along the shaft
Step 8 The bearing is released and is undamaged.
Hope this helps someone with the same problem as me.