My Mazda cartridge requires much more effort than a spin-on. First I unscrew a annen head bolt to drain the filter. next I unscrew the thermoplastic housing cap and remove the cartridge. Install new cartride and put a new o-ring on the thermoplastic cap and tighten, using a cap syle filter wrench. Next put a new o-ring on the drain bolt and install. After checking for leaks, I must replace the undercover, using the 7 screws and one plastice lock tab. Took me about 60 minutes the first time as a search for the correct allen wrench etc. I think now that I know what & how, I will be doing it in 20 minutes or so. The spin-on was a great idea. I could purchasethe piece that would allow me to use spin-ons but, at ~$40, I will keep using the cartridge.