Originally Posted by
cyclebycle13
That's my 15 year old silca superpista. Pump head hasn't changed over the years.
How would it unless you've changed it yourself? It's 15 yrs old. By the looks of it, your pump head extends a good 1" down the valve stem. There are many many pump heads that don't go anywhere near this far down a stem.
Here's a photo of my pump head's gasket.. somewhere between 7-8mm total thickness. This is inset approx. 4-5mm in from the very end of the pump head, meaning the end of the gasket is falling at 1.2cm from the end of the valve. At the worst, the most threaded stems I have begin about 1cm below the tip of the stem, meaning that 'maybe' the .7mm gasket is covering 1-2mm of the extra threads, but the bulk of the gasket is going over the stem cap's threads anyway. IOW, the discussion about threaded valves ruining pump heads is doing nothing but spreading FUD.