After a bit of trial an error, I worked up a technique that results in a very solid bond.
The lens caps are sanded down so that the mating surfaces are flat and somewhat rough (80 grit paper, IIRC). I then apply an epoxy that comes in two joined tubes and which is expressed with a single plunger (I can't recall the exact brand or type - I'd have to look for the tubes - but certain types work better). Finally, the two caps are pressed together firmly for a minimum of 12 hours using a small clamp (http://home.earthlink.net/~shel-pix/clamp.jpg). Shel > [Original Message] > From: Bob Sullivan > I use the 2 rear caps as well, but had the epoxie let go 20 years ago. > (Yes, I had properly prepared the mating surfaces!) > Since then, I've gone with duct (duc) tape arounf the edges. > It works great and is easy to check if it is still holding tight. > > On 12/25/05, Fred wrote: > > > In addition, I've made some rear lens caps that are solidly cemented > > > together, allowing two lenses to fit in the space that one lens often > > > takes. The caps work very well and hold the lenses securely. Once you've > > > learned which combinations (tele + wide, with/without hood, for example) > > > fit in any given compartment of your bag, you can then carry more lenses. > > > > Yes - I've been using one of Shel's "double caps" for some time, and in my > > usual kit bag it generally has an A 100/2.8 Macro on the bottom pointing > > down and an A 20/2.8 on top pointing up - it works quite well.
