We're no stranger to the Kaba Simplex line of products, very common on pool gates, and remote applications, this time tested line of mechanical push button locks are almost ubiquitous. Very robust and reliable, although not so easy to change the combination on. If you've ever tried and failed then you know what a challenge it can be. It's best to call a  professional to service these locks.  Our tech has been to official Kaba training on these products and has been working on them for 10  years. Contact us for service today, 210-929-2495