The commonest cause of starter motors to burn out is old age, but you've got that one covered! The second most common cause of starter motor burn out is the starter sticking on, or staying engaged after starting. This can be either a build up of dirt which stops the gear retracting when you let go of the key, or could be a short in the ignition, holding the starter motor in the start position when the key is released. Could also be a sticky starter relay, which would have the same effect.
Either way you should get to the bottom of the cause, cos sticking starter motors are a known source of ignition for car fires
Plus they ain't cheap to buy, although I imagine that you could negotiate a discount for bulk purchase
If your garage is reluctant to take on the work, I would suggest a good Auto Electrician would be able to sort it out Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!
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