With the heavy carbon and tungsten style caps like you have pictured the screwdriver method may not work. For those I can not get loose that HAVE PINS i bake them on an OLD PURE CAST IRON cookie sheet in our oven on the locked self cleaning setting. Gets to about 825 -850 for 30 minutes. Enough to obliterate the glue... and clean the oven from grease and grit at the same time. The lock opens automatically at <500° o i pull them out with gloves and tap them with tongs. And the spreaders slide off with minimal force.
Non+sold spreaders and aluminium caps. Starting in a recessed corner (where your z is) Push (gentle for now) a 1, 1.5, or 2mm (000, 00, or 0) diagonally corner to corner as far as light and gental will go. Remove screwdriver Using a long blade, non-snap-off box cutter run the blade around all four edges in a CIRCLE. This will cut through any edge sealant they've used. Insert your 000-0 back in this time in the middle through the centre glue. Push hard but gentle It may pop here for you... if not using a standard #1 pushing in and out with gentle twisting motions.
don't try a heat gun on those thick caps. Thr time/energy used to heat a heavy spreader enough to remove costs more on your electric bill than the price difference between with/out metal.
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