Dennis said in another post:

For doing tips we used to do this when we were a lot younger. Dope by itself is too slow to grab and hold the covering material in place so we used to mix Duco cement in a 50/50 ratio with the clear. Now to clarify this we only made up a little amount of this as we only used it to hold down really stubborn spots. It also worked great on undercambered wings. The weight was really negligable and it did sand out nicely.

Great minds always think alike  I use spring clip clothes pins for weight. As to buying something special from Aircraft Spruce etc. Why? The solution I've been using for 40 years works fine, and if it works don't fix it.
Covering with silk and dope  or silkspan has over the years become for me second nature. The same is true for most of the older modellers on the forum. We all have our favorite methods to achieve the results we want, Thats the most important thing, satisfactory results ,not just good enough.
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When using Silkspan I need a third hand.  Since I can't seem to grow one I use BULLDOG paper clips to hold tension on the Silkspan.  I attach one to the overhanging Silkspan then attach another one to the first and so on until enough weight has been added to hold tension until the dope is dry enough to remove them.