On the L6060 punching a hole through the HST filter is not an option during the first 50-hour service since all of the hydraulic fluid will drain out and that is a very costly error (not to mention your shop floor) .
The original HST filter was painted on with the frame and it's effectively glued on. And if you have a 3rd function kit with those additional hoses, they seem to run right below the HST filter. I did not have the upper body strength to get mine off. Called the mobile mechanic. He removed it and was able to quickly install the new one. We lost less than 10 liters of hydraulic fluid, which is to be expected. So make sure you have UDT fluid on hand before you remove the HST filter.