deskthority

The stuff I used has a tensile strength of just 2400 psi and an elongation-at-break of 20%. ABS has approx 6000 psi and 25%. I don't know much about POM. There are some urethanes that will give you an elongation at break of 400%, though with low tensile strength. There are ones with UV protection ...

Ah POM, I missed the link to the other site. I'm not sure how much the tooling is going to cost you but I think you can do the slider in a 2-part mould. For people not familiar with moulding, POM is a thermoplastic (hot) requiring (usually) steel moulds which are (obviously) rigid.

The top housing ...

Is there a specific reason it has to be made out of ABS? Urethane comes in all sorts of grades and hardness's. With ABS you need steel moulds, and they can get very expensive. With urethane you can use rubber moulds. FWIW, here is something I knocked up this evening:
Dscn1709.jpg

And the casing ...

Hi, new here, not sure if this is off topic, though it seems fairly close.

How do the Alps Plate Spring switches compare to the the Alps Buckling Springs?