As Kev said Spencer, I used a bath sealant, I`m always careful taking of the filter to clean.
The plastic washers are very hard, I would have thought softer ones would be better and theres not
a lot of thread to work with.
Another thing to watch for is the pressure adjuster, it`s just asking to be knocked and it will be.
What can happen is the priming switch will not close as it should and every time you stop the machine
for a few minuets, you will lose pressure and have to prime again, or at worst, complete pressure failure. The solution is to simply pull the adjuster over to its original position. Just got this worked out this week after months of re priming. It has worked hard for me the last few days with no pressure drop.
Yeah Fred still fancy a Prowler, Feel free to get in touch I could do with someone to pass work on to now and again.
Del, you tight git, are you watching your phone bill?

Hope this helps
Rab