Hi Joe,
Thankyou very much for that research mate, I have done the same and think I have found Stevesandra's problem.
The 415H is a slightly heavier duty chain than the standard Scotty drive chain and consequently, the plate thickness is thicker.
This would not allow a standard joining link to be used, because the spring retaining clip would not be able to engage in its corresponding groove correctly, and would spring off in use. wink
The solution would to be IMO, to purchase a suitable joining link especially for the 415H roller chain.

Here are some specs for your info:

# 35 3/8 pitch x 3/16 width
410 1/2 pitch x 1/8 width
410H 1/2 pitch x 1/8 width
# 43 1/2 pitch x 1/8 width
415H 1/2 pitch x 3/16 width
# 41 1/2 pitch x 1/4 width
# 40 1/2 pitch x 5/16 width
# 50 5/8 pitch x 3/8 width

The following is the American National Standards Institute (eg.)ANSI Standard Chain Dimensions:

Chain No. Pitch Roller Diameter Roller Width

Sprocket thickness Working Load

25 1/4" 0.130" 1/8"
0.110" 140 lbs

35 3/8" 0.200" 3/16" 0.168" 480 lbs

40 1/2" 5/16" 5/16" 0.284" 810 lbs

41 1/2" 0.306" 1/4" 0.227" 500 lbs

50 5/8" 0.400" 3/8" 0.343" 1400 lbs

60 3/4" 15/32" 1/2" 0.459" 1950 lbs

80 1" 5/8" 5/8" 0.575" 3300 lbs
Thanks again Joe,
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin