I have fallen heir to a lot of kits with many older style Sierra click pens .... the ones that require the half-inch spacer. I see that there was a thread several years back about them, in particular this item by gwilki.
I haven't done any of the pencils, but I've done quite a few of the pens. The mechanism seems to hold up well, and it's an easy kit to assemble. The biggest issue seems to be with the spacer that you need to use if you want to use a Parker style refill. Customers lose them the first time they take the pen apart. One solution is to shorten the tube to 1.88". You can then use a Parker refill without the spacer.
Unshortened,this kit can use the G2 roller ball refill. If you shorten it, you lose this option.
I am wondering if gwilki or anyone else can be more specific about fitting refills longer than the Parker ballpoint style to these older Sierra click pens and make them work. I tried using a Schneider rollerball and a Schmidt rollerball. While they are almost the same length as the Parker plus spacer, they don't seem to fit the Sierra click kits that I have.
Can anyone clarify or comment please. Thanks