small DPDTor SPDT slide swiches can be had from most electronics stores....however, attaching them to the point operating mechanism will depend on what method you are using.
I suspect currently you are using what us auldfahrts remember as the ''Mercontrol' system?
I have used wire from bike spokes as well...whatever.....
the switch is best linked to the system you actually handle...ie the lever itself, the bit YOU actually operate...sorry, description isn't my forte.
I drill a small hole through the plastic slider on the D/SPDT switch, bending the point operating wire through 90 degrees to pass through the hole.
Then I use the plastic slider to operate the point.
this overcomes the 'mechancal' resistance in the switch.
If you are using 'posh' levers, then you would need to link the lever to the plastic slider somehow?
An alternative to the DPDT slide switch..which is very robust.....maybe the Peco slide switches?
These are the ones that Peco want you to clip underneath their point motors.
they differ from the slide switches in that there is little resistance to the movement of the switch over its contacts.
These can be placed underneath the point tie bar, or alongside to engage in the control wire, or even at the lever end....as long as you arrange some method for the point,or control wire,or lever, to move the slider switch via its central hole....bit of stiff wire, for example?
The peco switches are less robust though, so be warned.
Wiring is simple..there ought to be 3 contacts [or 6 contacts.....3 each side.]
locate the ''always in touch' contact....usually the middle one, but not always.
The other two contacts will be ''either/or'...in other words, one will be connected to the first contact only, at any one time.
Take a wire from each rail at the entrance to the point, and connect each to one of the second pair of contacts mentioned.
then connect a wire from the crossing of the point, to the first contact mentioned.
Thus, the point crossing 'polarity' will be to which ever running rail the switch is thrown for.
SO, MAKE SURE THE SLIDE SWITCH IS ORIENTATED, SO THAT WHEN THE POINTBLADES ARE SET FOR ONE DIRECTION..IE THE CURVE, THEN THE CROSSING VEE IS CONNECTED ELECTRICALLY TO THE CURVED RAIL.....AND VICE VERSA FOR THE STRAIGHT??
if you happen to use a DPDT switch, then wire just the row of contacts on one side for the point.....I used the other to work signals, etc......or even to activate the drunken switchman?
I'd draw a diagram......but I struggle with dyslexic fingers.
don't forget to insulate the crossing vee from the rest of the world.