I have been using a unit that is somewhat like (hagshouse) uses but I believe it's a little easier to put together. I've used these for over five years with excellent results. I will attach a picture so you may look at the steps that are taken.
1. I start with a GoldTip nock ( the one that has the screw to tighten it to the arrow shaft) it has a hole already thru the nock.
2. Remove screw and drill out the nock using a #20 drill bit set to depth of approximatly 3/4 inch.
3. I use a little flat head nail cut to 1/4 inch as a firing pin.
4. The Trill light (available at Wally World). I first insert the firing pin coated with a little string wax (this keeps it from falling out while working with the light).
5. Work the Trill light on/off a few times to limber it up. Leave it in the offposition. Push the firing pin down in the nock so that it is level with the bottom of the nock slot.Insert theTrill light from the bottomuntil the firing pin moves up about 1/16th inch into the nock slot. Insert the nock into your arrow shaft.and adjust as necessaryandwhen firedthe string will push the firing pin down turning on the light. When you recover the arrow just pull the nock and shut off light and you may reuse it several times.
6. I use GoldTip 55/75 shafts and this works fine.However if the light or nock is loose in your size shaft just wrap a littleTeflon thread tape around light as you insert it into nock. This will tighten both the light to nock and the nock to shaft fit.

Have Fun
Ron